Answer:
9.4 × 10²³ atomsExplanation:
To find the number of entities in a given substance we use the formula
N = n × L
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
However we weren't given the number of moles only the mass of oxygen was given. we can find the number of moles from that by using the formula
[tex]n = \frac{m}{M} \\ [/tex]
m is the mass
M is the molar mass
n is the number of moles
Molar mass of oxygen = 16 g/mol
mass in question = 25 g
We have
[tex]n = \frac{25}{16} = 1.56 \\ [/tex]
number of moles = 1.56 mol
The number of oxygen atoms is equal to
N = 1.56 × 6.02 × 10²³ = 9.3912 × 10²³
We have the final answer as
9.4 × 10²³ oxygen atomsHope this helps you
the number of mole of iron produced from 0.216 mole of aluminum is:
3 FeO (l) + 2 Al (l) → 3 Fe (l) + 1 Al2O3
How many possible combinations are there for the values of l and ml when n = 3?
There are three possible values for the l and there are nine possible values for ml.
What are quantum numbers?The term quantum numbers has to do with the description that shows the most probable position of the electron in an atom. We know that the orbital is a region in space, where there is a high probability of finding the electrons.
Given that the values of l must be in the range of 0 to n - l and the values of ml must be in the rang of -l to + l. we then can use this to know the number of the possible combinations of l and ml when n = 3.
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Below is the word equation for the reaction between sodium hydroxide and hydrochloric acid. Identify the reactant(s) in the reaction. Sodium hydroxide + Hydrochloric acid → Sodium chloride + Water
I a chemical reaction, we have the reactants in the left part,followed by an arrow and then the products.
So, the reactants are the two that are in the left part of the equation:
Sodium hydroxide and Hydrochloric acid
What is made of two or more substances that are together in the same place but are not chemically combined
When two or more substances are together in the same place but are not chemically combined they form a mixture.
What is a mixture?The word mixture is used in chemistry to denote a combination of two or more elements that conserve their original properties, which is fundamental to achieving the separation of such elements in the future.
Therefore, with this data, we can see that a mixture is a mix or combination of two or more elements that still conserve their physical and chemical properties, thereby allowing their separation through different techniques.
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based on research, would you consider natural gas a clean source of energy?
Answer:
Explanation:
Here, we want to consider if natural gas is a clean energy source
A clean energy source is one with zero environmental pollution effects
At present, it is quite impossible for natural gas plant not not release heat-trapping gases into the atmosphere. Although this can be largely reduced as we can see in new generation plants. However,this does not move us from the point that natural gas is itself not a clean energy source due to its by-product from usage.
Hence, our answer here is NO, natural gas is not a clean source of energy
If the specific heat of methanol is 2.44 J/k -g how many joules are necessary to raise the temperature of 40g of methanol from 50⁰c to 60⁰c?
Explanation:
[tex]q = mc(t2 - t1)[/tex]
[tex]q = 40 \times 2.44 \times (60 - 50)[/tex]
[tex]q = 976 \: joules[/tex]
The average college student uses 320 pounds of paper per year. How many
ounces of paper does an average college student use per day?
1 pound = 16 ounces 1 year= 365 days
*
Based on the conversion factor, the number of ounces of paper an average college student uses per day is 14 ounces of paper per day
What is the conversion factor from pounds to ounces?A conversion factor is a value that is used to make the conversion from one unit of measurement to another.
The conversion factor from pounds to ounces is given below as follows:
1 pound = 16 ounces
Also, the conversion factor from years to days is given below as follows:
1 year = 365 days
Hence, the ounces of paper an average college student uses per day are calculated as follows;
320 pounds = 320 * 16 ounces
320 pounds = 5120 ounces
Ounces of paper per day = 5120 / 365
Ounces of paper per day = 14 ounces per day
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How can you find the number of particles in a salt packet of known mass?Place the tiles to complete the equation to convert from grams to particles. Refer to the mole road map to determine the correct conversion factors. Use the space below to take notes or make calculations if needed.
First, you need to transform grams of NaCl into moles of NaCl. For this, you will divide by its molar mass. If you divide a fraction, If you divide a fraction, it is inverted and multiplied. So first you have:
0.75 g NaCl x 1 mol NaCl / 58.4 g/mol NaCl = 1.28 x 10^-2 moles
Now you need to use the avogrado's constant to find the number of particles. The avogrado's constant value is 6.02x10^23 mol^-1.
So you have:
0.75 g NaCl x 1 mol NaCl / 58.4 g/mol NaCl x 6.02 x 10^23 particles NaCl / 1 mol NaCl = 7.73 x 10^21 particles of NaCl
distinguish between kinetic energy and potential energy
Potential energy is stored energy in an object. Potential energy is the product of mass of an object, acceleration due to gravity and height of an object where it is placed.
Potential energy = mgh
m = mass of an object
g = acceleration due to gravity
h = height of an object
The S.I. unit of potential energy is joule and is represented by J.
Kinetic energy is energy of an object due to its movement. Kinetic energy is the product of mass of an object and velocity of an object shown by :-
Kinetic energy = 1/2 mv²
m = mass of an object
v = velocity of an object
The S.I. unit of kinetic energy is joule and is represented by J.
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I NEED HELP! WILL MARK BRAINLIEST!
Isotopes of certain ___ elements that spontaneously emit ___ and ___ from the ____.
Isotopes of certain radioactive elements that spontaneously emit radiation and rays from the nuclei.
How do isotopes form?Isotopes can be artificially created by bombarding a stable nucleus with charged particles using accelerators or nucleons in a nuclear reactor, or they can be created normally through the nuclear reactions of a nucleus (i.e., emission of energy in the form of of alpha particles, beta particles, neutrons, and photons).
Who discovered isotopes?Soddy at the Glasgow University at his lab. The idea of isotopes—that elements could have more least 1 atomic weight—was first forth by English radiochemist Frederick Soddy in a public letter that appeared in the Dec. 4, 1913, issue of Nature. His formula won him the 1921 Nobel Prize in Chemistry.
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Is pollution parasitism or commensalism
The answer would be parasitism.
Let's define each term.
Parasitism: A relation between organisms in which one lives as a parasite on another.
Commensalism: A type of relationship between two species of plant, animal, fungus, etc., in which one lives with, on, or in another without damage to either.
Pollution: The introduction of harmful substances or products into the environment; the act of polluting or the state of being polluted.
Under some conditions, parasitism poses a major hazard to hosts, and environmental pollution has a detrimental impact on organism health as well. The concomitant effects of contaminants and parasites on an organism's physiological homeostasis are poorly understood. The current study indicates that parasites can: I affect how pollutants are metabolized by infected hosts; (ii) interact with pollution in positive or negative ways; and (iii) cause physiological changes in hosts that were previously assumed to be caused by pollution. Fish infected with acanthocephalans have lower metal levels than uninfected hosts, according to experimental studies on the uptake and accumulation of metals by fish. For instance, Pomphorhynchus laevis lowers lead levels in fish bile, which lessens or impedes the cycling of lead in the liver and intestines, potentially lowering the amount of metals available to fish. Thus, changes in pollutant absorption and accumulation caused by parasites in various intermediate and ultimate hosts are crucial to the study of ecotoxicology. Along with these changes, there is a strong relationship between the impacts of pollutants and parasites that appears to be partly mediated by the endocrine system, which is intimately linked to the immune system in fish. Studies in the lab on eels that had been artificially infected with the swimbladder worm Anguillicola crassus have shown that harmful substances like polychlorinated biphenyls have immunosuppressive effects that make parasite infection easier. Similar to this, a decrease in anti-A. crassus antibody levels is associated with an increase in blood cortisol concentration in eels as a result of chemical exposure and infection. Additionally, parasites are capable of inducing physiological modifications that are ascribed to substances with endocrine disrupting action, for instance, the cestode Ligula intestinalis is known to inhibit roach gonad growth. Roach are the best instances of endocrine disruption in wild fish, and it is likely that this disruption may be brought on by parasites like L. intestinalis or members of the phylum Microspora in addition to chemical action.
Thanks,
Eddie
Answer:
the answer is parasitism
For the reaction CH4 + 202-> CO₂ + 2H₂O, how many moles of water are produced alongside 100g of carbon dioxide.
ANSWER
The number of moles of water produced is 4.54 moles
EXPLANATION
Given that:
[tex]\text{ CH}_4\text{ }+2O_2\text{ }\rightarrow\text{ CO}_2\text{ }+\text{ 2H}_2O[/tex]The mass of carbon dioxide is 100g
To find the moles of water, follow the steps below
Step 1: Calculate the moles of carbon dioxide using the formula below
[tex]\text{ Mole }=\text{ }\frac{\text{ mass}}{molar\text{ mass}}[/tex]Recall, that the molar mass of CO2 is 44.01 g/ mol
Step 2: Substitute the given data into the formula in step 1
[tex]\begin{gathered} \text{ mole }=\text{ }\frac{100}{44.01} \\ \text{ mole }=2.272\text{ moles} \end{gathered}[/tex]Step 3: Find the moles of water produced using a stoichiometry ratio
In the reaction above, 1 mole of CO2 is equivalent to 2 moles of H2O
Let x represent the number of moles of water
[tex]\begin{gathered} \text{ 1 mole CO}_2\text{ }\rightarrow\text{ 2 moles H}_2O \\ \text{ 2.272 moles CO}_2\text{ }\rightarrow\text{ x moles H}_2O \\ \text{ Cross multiply} \\ \text{ 1 mole CO}_2\text{ }\times\text{ x moles H}_2O\text{ }=\text{ 2 moles H}_2O\times2.272\text{ moles CO}_2 \\ \text{ Isolate x} \\ \text{ x }=\frac{2\text{ moles H}_2O\times2.272\cancel{molesCO_2}}{1\cancel{moleCO_2}} \\ \text{ x }=\text{ 2 }\times\text{ 2.272} \\ \text{ x }=\text{ 4.54 moles} \end{gathered}[/tex]Therefore, the number of moles of water produced is 4.54 moles
the relative density of lead is 11. Calculate it's density.
Under the given conditions, the density of lead is 11000 kg/m∧3.
What is relative density?
The proportion of a substance's density to that of reference material under particular circumstances is called relative density. The standard measure for liquids and solids is often water at 4°C or another predetermined temperature. An ice cube, for instance, has a relative density of 0.91 and will float. A substance will sink if its relative density is greater than 1. Both the reference and the sample must have a specific temperature and pressure.
Let the Relative density of lead be R
The density of water is ρw
We know,
Relative density R = 11
Density of water = 1000 kg/m∧3
Density of lead = 11 × ρwater = 11 × 1000 kg/m∧3 = 11000 kg/m∧3
Hence, the density of lead is 11000 kg/m∧3.
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Density of water, ρ
water
=1000 kg/m
3
=1 g/cm
3
⟹ρ
lead
=11.3×ρ
water
ρ
lead
(in g/cm
3
)=11.3×1
ρ
lead
(in g/cm
3
)=11.3 g/cm
3
And,
ρ
lead
(in kg/m
3
)=11.3×1000
ρ
lead
(in kg/m
3
)=11300 kg/m
3
Consider the chemical reaction that takes place between aqueous iron(III)
nitrate and aqueous sodium hydroxide.
Complete the balanced molecular chemical equation for the reaction below.
If no reaction occurs, write NR after the reaction arrow. Be sure to include
the proper phases for all species within the reaction.
Fe(NO3)³(aq) + NaOH(ag) →|
Answer:
[tex]Fe(NO_3)_3 (aq) + 3 NaOH (aq) = > Fe(OH)_3 (s) + 3NaNO_3 (aq)[/tex]
The oxidation state of the iron does not change and this is a double displacement reaction. Fe(OH)3 may decompose further into some oxyhydroxides but the equation provided is probably what the questioner is asking for
An instantaneous dipole occurs when a molecule's moving electrons are briefly more concentrated in one place than another, causing the molecule to become temporarily polarized.
True
False
An instantaneous dipole occurs when a molecule's moving electrons are briefly more concentrated in one place than another, causing the molecule to become temporarily polarized.
The correct option is True.
What are dipoles?Dipoles refer to a separation of charges where one end of a substance has a positive charge while the other end has a negative charge.
In chemical compounds, dipoles occur within a molecule that has covalently bonded atoms or atoms that share electrons in the covalent bond.
The dipole may be permanent dipoles or temporary dipoles.
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Can I know the answer ？
According to the given statement Mass of one atom of gold in grams is 196.78 g.
What is a atom ?A chemical element is uniquely defined by its atoms, that are small bits of substance. An atom is made up of a core nucleus one and or more negatively charged electrons that orbit it. The positively charged, relatively hefty protons and neutrons that make it up the nucleus may be present.
Who discovered the atom?Up until the 1800s, this idea of tiny, indivisible pieces of matter remained. The contemporary atomic idea was really started by the eminent chemist John Dalton (1766–1844). But his atom was like a rock-solid ball.
Briefing:Molar mass is the weight in grams of one mole of an atom.
1 mole = 6.022×10²³ atoms
Molar mass of Gold (Au)
= mass of an atom × number of atoms
=3.207×10-²²×6.022×10²³
=196.78g.
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Methanol has a density of 0.792 g/mL. What is the volume of 0.5 moles of methanol?
Density=0.792g/ml
Volume=?
We know, Density = Mass/volume
Moles=0.5
To calculate mass, no of moles = given mass/ molar mass
Molar mass of methanol= 32
On calculating, given mass= 0.5*32 = 16g
Volume of methanol = Mass/Density
=16/0.792
=20.202 ml
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50 POINTS!!! GOOD AND EXPERT ANSWER ONLY!!! DONT WRITE FAKE ANSWERS FOR POINTS OTHERWISE THEY WILL BE DELETED!!!
The cathode ray experiment indicated the existence of negatively charged particles in an atom. This experiment also disproved the part of Dalton's atomic model that claimed indivisibility of the atom. When the experiment was repeated using cathodes made of a different metal, each time the results were consistent. These discoveries of Thompson were later substantiated by Robert Millikan when he calculated the charge on an electron.
Use information from the passage to justify whether the characteristics of reliable scientific explanations are present in the development of the atomic theory.
The characteristics of scientific explanation are included in the development of the atomic theory.
What is the scientific method?The development of a scientific idea always follows the scientific method. The scientific method includes the proposition of a hypothesis, the confirmation or disapproval of the initial hypothesis, and experimentation.
Dalton's primary ideas were laid aside as stronger empirical evidence developed. J.J. Thomson's experiment has given the atomic model while the nucleus and electron were discovered by the experiments of Rutherford, Geiger, and Ernest Marsden.
Since there was experimentation at certain points to confirm or disprove the propositions, therefore, there was a deep involvement of the scientific method in the development of the atomic theory.
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Ammonium nitrate (NH4NO3), a common fertilizer, is 35.0% nitrogen by mass. How much ammonium nitrate contains 1.25 kg of nitrogen?
The amount of ammonium nitrate contains 1.25 kg of nitrogen is 3571.42 gm
Percent composition tells you with the aid of mass what percent of each detail is found in a compound. A chemical compound is a mixture of or greater factors. in case you are analyzing a chemical compound, you may want to find the percentage composition of a sure detail within that chemical compound.
The percentage composition is the percentage through the mass of each detail in a compound.
The molar mass of ammonium nitrate (NH₄NO₃) = 14 + 4 + 14 + 48 = 80 g.
percentage composition of Nitrogen = 35%
Percentage composition of Hydrogen = 5%
Percentage composition of Oxygen = 60%
35% of 80 g ammonium nitrate (NH₄NO₃) = 80 × 35/100
= 28 g.
∵ 28 grams of nitrogen contained in = 80 grams of ammonium nitrate (NH₄NO₃)
1250 g of nitrogen contained in = (80/28) × 1250 grams of ammonium nitrate (NH₄NO₃)
= 3571.42 g of ammonium nitrate (NH₄NO₃)
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A 0.325g of KHP required 20.15ml of NaOH for neutralization. Calculate the molarity of NaOH
The molarity of NaOH solution that required 20.15mL is 0.0004032M.
How to calculate molarity?Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
Molarity of a solution can be calculated by dividing the number of moles in the solution by the volume as follows:
Molarity = no of moles ÷ volume
According to this question, 0.325g of KHP required 20.15ml of NaOH for neutralization. The number of moles in this mass can be calculated as follows:
no of moles = 0.325g ÷ 40g/mol
no of moles = 0.008125mol
Molarity = 0.008125mol ÷ 20.15mL
Molarity = 0.0004032M
Therefore, 0.0004032M is the molarity of the solution.
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iven the following reactions,
Fe2O3 (s) + 3CO (s) 2Fe (s) + 3CO2 (g) H = -28.0 kJ
3Fe (s) + 4CO2 (s) 4CO (g) + Fe3O4 (s) H = +12.5 kJ
the enthalpy of the reaction of Fe2O3 with CO (below) is _____________ kJ.
3Fe2O3 (s) + CO (g) CO2 (g) + 2Fe3O4 (s)
Enthalpy of reaction when CO(s) reacts with Fe₂O₃(s) is +15.5KJ.
First let us write all the reactions,
Fe₂O₃(s) + 3CO(s) → 2Fe(s) + 3CO₂(g); ΔH₁ = -28.0 kJ, Equation 1,
3Fe(s) + 4CO₂(s) → 4CO(g) + Fe₃O₄(s) ; ΔH₂ = +12.5 kJ, Equation 2,
Enthalpy of reaction of CO(s) and Fe₃O₄(s) can be found by,
Adding the two given equation,
Fe₂O₃(s) + 3CO(s) + 3Fe(s) + 4CO₂(s) → 2Fe(s) + 3CO₂(g) + 4CO(g) + Fe₃O₄(s)
Further solving,
Fe₂O₃(s) + Fe(s) + CO₂(s) → CO(s) + Fe₃O₄(s); ΔH = ΔH₁+ΔH₂
Now, reversing the equation,
CO(s) + Fe₃O₄(s) → Fe₂O₃(s) + Fe(s) + CO₂(s); ΔH = -(ΔH₁+ΔH₂)
On reversing a reaction the sign of the Enthalpy changes,
So, the enthalpy,
ΔH = -(ΔH₁+ΔH₂)
ΔH = -(-28+12.5)KJ
ΔH = 15.5 KJ.
Hence the enthalpy of reaction is 15.5KJ.
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how many moles of HCL are required to prepare 0.80L of a 0.5M HCL solution
Answer:
[tex]0.4\text{ mol}[/tex]Explanation:
Here, we want to get the number of moles
Mathematically:
[tex]Number\text{ of moles = molarity }\times\text{ volume}[/tex]We have that as:
[tex]Number\text{ of moles = 0.5 }\times\text{ 0.8 = 0.4 mol}[/tex]How does temperature of land far from water compare to that of land near water?
The temperature of land far from water is hotter than land near water.
The temperature of land far from water is less stable compared to land near water.
The temperature is similar for land both near and far from water.
The temperature is either too hot or too cold near water.
The temperature of land far from water is hotter than land near water.
Why the temperature of land far away from water different from land near water?The lower heat capacity of land often allows them to cool the nearby water temperature so it takes less energy to change the temperature of land compared to water bodies. This means that land heats and cools more quickly as compared to water. This difference affects the climate of different areas on Earth. Large bodies of water like oceans, seas and large lakes can affect the climate of the nearby regions such as coastal regions. Water heats and cools more slowly than land regions. The coastal regions will stay cooler in summer season and warmer in winter season, which creates moderate climate on the coastal regions.
So we can conclude that the temperature of land far from water is different from land near water because of cooling effect of water bodies.
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A 300K gas at 1.5 atm is pressurized to 2.25 atm. What is its resulting temperature in K?
Step 1 - Understanding the relation between temperature and pressure
There are three main variables that can modify the state of a gas: pressure (P), volume (V) and temperature (T). When one of them is kept constant, linear relationships arise between the remaining two.
So when we keep the volume constant (isovolumetric transformation), the pressure and the temperature become directly proportional, i.e., the greater the temperature, the greater the pressure and vice-versa.
We can state it mathematically as:
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]Step 2 - Using the equation to solve the question
C2H4O2 IS THE EMPIRICAL FORMULA FOR GLUCOSE?
The empirical formula of the glucose molecule is written as [tex]CH_{2} O[/tex].
What is the empirical formula for glucose?Let us recall that glucose is the molecule that is response for the quick release of energy in the body. It is also the molecule that is first formed in the process of photosynthesis.
The term carbohydrate actually means a compound that is a hydrate of carbon and it is composed of glucose molecules. The empirical formula shows the relationship or the ratio of the atoms that could be found in a compound. We can see that we can obtain the ratio from the number of each of the atoms present.
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Which of the following correctly explains why an object floats on water?(1 point)
Responses
An object that has less mass in the same amount of volume, is supported by the water underneath it.
An object that has less mass in the same amount of volume, is supported by the water underneath it.
An object that has less volume in the same amount of mass, is supported by the water underneath.
An object that has less volume in the same amount of mass, is supported by the water underneath.
An object that has less tightly packed atoms than water is not supported by the water underneath it.
An object that has less tightly packed atoms than water is not supported by the water underneath it.
An object that has more tightly packed atoms than water is supported by the water underneath it.
HELP PLEASE RIGHT ANSWERS ONLY. A legend is a traditional story that explains something in real life. Sometimes they are accepted as true, but sometimes they are fantastical and just plain fun. There are many legends that surround the North Star explaining its creation as well as why it is stationary.
Take some time to research some of the legends of the North Star. After you have had a chance to read several of them, create your own fantastical story of the North Star. It can be how it came to be or explain why it is stationary.
The North star is stationary because it helped as a reference point in describing the location of a place in Bethlehem.
What is a Star?This is a celestial body which is characterized by the presence of gases which are mostly hydrogen and helium and are held together by its own gravity.
The origin of the North star was in the creation of the stars by God in which a small dot was left. This resulted in the dot wanting to be like other stars. The wish was the later granted and it was the Star of Bethlehem which was stationary and helped in the precise location of the place.
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how do i calculate the mass of the product of this equation : 2Fe+3Cl2-->2FeCl3, given that I have 5 grams of Chlorine
To calculate the mass of the product FeCl₃, we will need to do the following steps:
1 - Calculate the molar masses of Cl₂ and FeCl₃.
2 - Calculate the number of moles of Cl₂ in 5g of it.
3 - Calculate the number of moles of FeCl₃ given the stoichiometry of the reaction.
4 - Calculate the mass of FeCl₃ for the calculatd number of moles.
(we will use M for molar mass, m for mass and n for number of moles)
1 - The molar masses can be calculated using the molar masses of the elements in each compound:
[tex]\begin{gathered} M_{Cl_2}=2\cdot M_{Cl} \\ M_{Cl_2}=2\cdot35.453g\/mol \\ M_{Cl_2}=70.906g\/mol \end{gathered}[/tex][tex]\begin{gathered} M_{FeCl_3}=1\cdot M_{Fe}+3\cdot M_{Cl} \\ M_{FeCl_3}=(1\cdot55.845+3\cdot35.453)g\/mol \\ M_{FeCl_3}=162.204g\/mol \end{gathered}[/tex]2 - Now, we need to calculate the number of moles of Cl₂, so we will use the molar mass of Cl₂.
So, for the number of moles of Cl₂, we have:
[tex]\begin{gathered} M_{Cl_{2}}=\frac{m_{Cl_2}}{n_{Cl_{2}}} \\ n_{Cl_2}=\frac{m_{Cl_2}}{M_{Cl_{2}}}=\frac{5g}{70.906g\/mol}=0.070515\ldots mol \end{gathered}[/tex]3 - Now, we need to apply the stoichimetry. We can use rule of three for this.
From the balanced equation, we see that for each 3 Cl₂ that react, we will produce 2 FeCl₃.
So, we know that we actually have 0.070515...mol of Cl₂, so we use the rule of three to see how many moles we will produce of FeCl₃:
FeCl₃ --- Cl₂
2 --- 3
n --- 0.070515...mol
So, we have the equation:
[tex]\begin{gathered} \frac{2}{n}=\frac{3}{0.070515\ldots mol} \\ 2\cdot0.070515\ldots mol=3n \\ 0.141031\ldots mol=3n \\ 3n=0.141031\ldots mol \\ n=\frac{0.141031\ldots mol}{3} \\ n=0.047010\ldots mol \end{gathered}[/tex]And this is the number of moles of FeCl₃, so we can indicate this with the subscript:
[tex]n_{FeCl_3}=0.047010\ldots mol[/tex]4 - Finally, we will use now the molar mass of FeCl₃ to calculate the mass of 0.047010...mol of FeCl₃. The equation is the same as we used for Cl₂, but we will find the mass instead of the number of moles:
[tex]\begin{gathered} M_{FeCl_3}=\frac{m_{FeCl_3}}{n_{FeCl_{3}}} \\ m_{FeCl_3}=n_{FeCl_3}\cdot M_{FeCl_3}=0.041010\ldots mol\cdot162.204g\/mol=7.6253\ldots g \end{gathered}[/tex]So, the mass is 7.6253...g, but since we started with the mass of 5g, we have only one significant figure, so if we strickly consider the number of significant figures, we need to end up with only one, so:
[tex]m_{FeCl_3}\approx8g[/tex]So, the mass that we will produce if all the 5 grams react is 7.6253...g or, approximately 8g.
A piece of metal has a mass of 32.4g and has a volume of 24.9cm³. What is its
density?
A piece of metal has a mass of 32.4g and has a volume of 24.9cm³, then its density is 1.301 g/cm³
What is density?Density is defined as mass of a material substance per unit of the volume. The equation for density is d = M/V, where d stands for density, M for mass, and V for volume.
Grams per cubic centimeter are a common unit of density measurement. For instance, the density of Earth is 5.51 grams per cubic centimeter, whereas the density of water is 1 gram per cubic centimeter.
Density measures how tightly a mass of matter is packed. The density of a mass depends on how tightly it is packed in relation to the volume that it takes up. A low density substance, on the other hand, has a lower mass to volume ratio.
The amount of a substance present when its density is being measured ought not to have an impact on its density, in theory. The ratio of mass to volume should be constant regardless of the size of the sample being tested.
The formula of density is
[tex]\rho ={\frac {m}{V}}[/tex]
Where,
[tex]\rho[/tex] = density
m = mass
V = volume
We have given
m = 32.4g
V = 24.9cm³
[tex]\rho[/tex] = 32.4g/24.9cm³
[tex]\rho[/tex] = 1.301 g/cm³
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What is a scanning tunneling microscope?An instrument used to view cells and bacteria.An instrument used to view viruses.An instrument used for imaging surfaces at the atomic level.An instrument used to view quarks.
Explanation:
A scanning tunneling microscope is a type of microscope widely used both in industrial and fundamental research to obtain atomic scaled images. It is basically used for imagaing surfaces at the atomic level.
Answer:
The third option is correct.