The empirical formula of the unknown compound is C2H4O
Number of moles = mass / molar mass
------
molar mass of CO2 = 44 g/ mole
Moles of CO2 =6.99/44 = 0.152 moles
Since there is 1 mole of C in CO2
so, no. of moles of C = 0.152moles
mass of C = 0.152x 12 = 1.824 g
-------
molar mass of H2O = 18 g/ mole
moles of H2O =2.86/18 = 0.158moles
Since there are 2 moles of H in H2O
so, no. of moles of H = 0.158x2 = 0.317 moles
mass of H = 0.317x1.0079 = 0.3202g
--------
Total mass of H and C = 0.3202+1.824 = 2.144g
mass of sample = 3.50 g
mass of O = 3.50 - 2.144= 1.356 g
moles of O=1.356/16= 0.08475 moles
molar ratio of C : H : O =1.824 : 0.3202 : 0.08475
smallest number = 0.0847
Divide number of moles of C,H and O by the smallest number:
Molar ratio of C : H : O = 21.53 : 3.9 : 1.0
= 2:4:1
Hence the Empirical formula is C2H4O
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at 25 oc the solubility of magnesium fluoride is 1.17 x 10-3 mol/l. calculate the value of ksp at this temperature. give your answer in scientific notation to 2 significant figures (even though this is strictly incorrect).
The solubility constant is[tex]$6.4 \times 10^{-9}$[/tex].
The equilibrium for the solubility of the salt, [tex]$\mathrm{MgF}_2$[/tex] is,
[tex]$$\mathrm{MgF}_2(s) \stackrel{\mathrm{H} \cdot \mathrm{O}}{\rightleftharpoons} \mathrm{Mg}^{2+}(a q)+2 \mathrm{~F}^{-}(a q)$$[/tex]
The solubility product constant for [tex]$\mathrm{MgF}_2$[/tex] is,
[tex]$$K_{\text {吶 }}=\left[\mathrm{Mg}^{2+}\right]\left[\mathrm{F}^{-}\right]^2$$[/tex]
The molar solubility of [tex]$\mathrm{MgF}_2$[/tex] is taken as x, the x moles of [tex]$\mathrm{MgF}_2$[/tex]is dissolved in one litre water to produce x moles of [tex]$\mathrm{Mg}^{2+}$[/tex]and 2x moles of [tex]$\mathrm{F}^{-}$[/tex].
[tex]$\begin{array}{lccc} & \mathrm{MgF}_2(s) & \stackrel{\mathrm{H}_2 \mathrm{O}}{\rightleftharpoons} \mathrm{Mg}^{2+}(a q)+2 \mathrm{~F}^{-}(a q) \\ \text { Initial } & x & 0 & 0 \\ \text { Change } & & +x & +2 x \\ \text { Equilibrium } & x & 2 x\end{array}$[/tex]
The solubility product constant for[tex]$\mathrm{MgF}_2$[/tex] is,
[tex]$$\begin{aligned}K_{u p} &=\left[\mathrm{Mg}^{2+}\right]\left[\mathrm{F}^{-}\right]^2 \\&=(x)(2 x)^2 \\&=4 x^3\end{aligned}$$[/tex]
Substitute the solubility of [tex]$\mathrm{MgF}_2$[/tex] as [tex]$1.17 \times 10^{-3} \mathrm{~mol} / \mathrm{L}$[/tex]in the above equation as shown below:
[tex]$$\begin{aligned}K_{i p} &=4 x^3 \\&=4\left(1.17 \times 10^{-3}\right)^3 \\&=6.41 \times 10^{-9}\end{aligned}$$[/tex]
The solubility constant is [tex]$6.4 \times 10^{-9}$[/tex].(using 2 significant figures).
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In the titration of acetic acid and naoh, the use of the color indicator requires that excess base be added in order to detect the endpoint. Will this cause the calculated and reported mass percent of acetic acid in vinegar to be too high or too low? explain.
When excess base is added in order to detect the end point, then it will cause the calculated and reported mass percent of acetic acid in vinegar to be too high.
A titration is a method of quantitative chemical analysis, in which the concentration of an unknown solution called the analyte, by using a solution of known concentration, called the titrant.
The titrant solution from the burette is added slowly to the analyte solution, in the conical flask, in order to determine the end point of the titration. The end point is indicated by a change in color of the solution in the presence of an indicator.
An acid-base titration involves a neutralization reaction between an acid and a base.
As given in the question, the concentration of acetic acid solution is being determined by sodium hydroxide (NaOH) solution of known concentration.
Therefore, Sodium hydroxide is the titrant and is taken in the burette. Whereas, acetic acid is the analyte which is taken in the conical flask and two- three drops of the indicator is added to it.
Example of the indicator that can be used in an acid-base titration is phenolphthalein. Phenolphthalein is colorless in acidic medium and pink in basic medium.
Initially, the analyte acetic acid solution will be colorless. Since, phenolphthalein is colorless in acidic medium.
Then, NaOH solution will be slowly added from the burette to the acetic acid solution. On reaching the end point, a slight excess amount of the NaOH base is added from the burette.
The excess amount of NaOH makes the solution in the conical flask basic. Therefore, changing the color of the solution, from colorless to pink. Since, phenolphthalein is pink in basic medium.
This excess amount of the titrant i.e. NaOH solution added, increases the volume of the NaOH solution being used in the titration.
Since, acetic acid is directly proportional to volume of NaOH or any base used, then even a slight increase in the volume of the NaOH solution, increases the concentration or molarity of acetic acid
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at 20°c, a cell containing 0.6m glucose is in equilibrium with its surrounding solution containing 0.5m glucose in an open container. what is the cell’s ψp?
The cell’s pressure potential or ψp is 2.44 bars if the cell contains 0.6M glucose at 20°c with its surrounding solution containing 0.5M glucose.
As;
ψoutside = ψcell ( here ψ represents water potential)
Therefore;
ψp outside + ψs outside = ψp cell + ψs cell ( Since, ψ = ψp + ψs)
As ψs = -iCRT, therefore
0 + (-iCRT outside) = ψp cell + (-iCRT cell)
In iCRT, i represents the ionization constant
C represents the Molar concentration
R represents the Pressure constant 0.0831 liter bars/mole at degrees Kelvin
T represents temperature (degree kelvin)
Substituting the values;
(-1)(0.5M)(0.0831)(20 + 273) = ψp - (1)(0.6M)(0.0831)(20 +273)
-12.17 = ψp cell - 14.61
ψp cell = (-12.17) + 14.61
ψp cell = 2.44 bars
Therefore, the cell’s pressure potential (ψp) is calculated to be 2.44 bars if the cell contains 0.6M glucose at 20°c with its surrounding solution containing 0.5M glucose.
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why do you think printing a document on basic paper will help to ensure that it will last for a very long time
Answer:
So there is a physical version of it.
caco3 is added to a 250 ml volumetric flask with 50 ml of water. hcl is added drop-wise until effervescence is not longer observed, and then diluted to the mark. what is the molarity of caco3 in the flask?
The concentration of the calcium ions in the solution is obtained as 0.013 M
What is the molarity of the solution?Now we have to find the concentration of the calcium ions, we have to look at the question. We can see from the question that;
Mass of calcium carbonate = 0.3205g
Number of moles of calcium carbonate = 0.3205g /100 g/mol = 0.003205 moles
Number of moles calcium ions = 0.003205 moles
The question here is that we ought to find the concentration of the EDTA solution and that is what we need to find in the spaces that follow in this answer as we have here.
Concentration of the calcium ions in the solution = 0.003205 moles/250 * 10^-3
= 0.013 M
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Missing parts;
A 0.3205g sample of CaCO3 was dissolved in HCl and the resulting solution diluted to 250.ml in a volumetric flask. A 25 mL sample of the solution required 18.75mL of EDTA solution for titration to the Eriochrome Black T end point. What is the concentration of Ca2+ (mol/L) in the 250.0ml of CaCl2 solution?
Which two notations represent isotopes of the same element?
1.
2
3.
4
^14 7N and ^18 7N
^20 7N and ^20 10 Ne
^14 7N and ^17 10Ne
^19 7N and ^16 10 Ne
" 14/7 N and 18/7 N "
Isotopes are two or more different atom types that share the same atomic number and place in the periodic table but have different quantities of neutrons in their nuclei, resulting in various nucleon numbers.
Isotopy is a phenomenon in chemical element atoms defined by a difference in the mass number of an element's atoms, even if the atoms always have the same atomic number.
The variation in neutron counts is thought to be the cause of the variance in mass number. This is true because an element's atomic number, which determines how many protons are present in its nucleus, is constant for isotopes.The number of neutrons and protons in the atom's nucleus is represented by the mass number, on the other hand.The choice in this case corresponds to two nitrogen atoms that have the same atomic number but different masses.To know more about isotopes, click on the link below:
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Draw the Lewis dot diagram for lithium (p.180)
the Lewis dot diagram for lithium is
if a mixture consisting of 10 % cyclohexane and 90 % toluene were distilled in a fractional distillation apparatus having 2 theoretical plates, what would the composition of cyclohexane be in the first drop of distillate? %
The first drop of distillate would contain 33 mol% of toluene and 67 mol% of cyclohexane. We can reach this conclusion by consulting the boiling point composition curve attached.
When analyzing the composition of the vapor phase and the liquid phase during the distillation of two liquids with different boiling points, it is necessary to use the boiling point composition curve.
We begin on the right by finding the point on the curve that corresponds to our initial mixture composition (90 mol% toluene, 10 mol% cyclohexane). We then move to the left, to find the composition of the vapor phase. This will be the composition of the distillate after one theoretical plate (approximately 67 mol% toluene, 33 mol% cyclohexane). Because we have two theoretical plates, we repeat the process, but now the composition of the liquid phase is the same as the vapor phase because we are now basically distilling our first distillate for the second time.
So we again move to the left to find the composition of the vapor phase, which will be the composition of our distillate after two theoretical plates: 33 mol% toluene and 67 mol% cyclohexane.
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The relative atomic Mass of boron is 9. What do you mean by this statement?
Answer:
Boron has different isotopes with different atomic masses. The relative atomic mass of boron, which is 9, is the average of the atomic masses of the isotopes
Explanation:
The relative atomic mass is indicated in terms of its heaviness compared to the parts of mass of carbon-12. The relative mass of boron is 9 means its mass relative to the mass of carbon -12 is 9 amu.
What is relative atomic mass ?The relative atomic mass of an element is the mass relative to the mass of carbon-12 or it can be defined as the number which indicates how many times the mass of one atom of the element is heavier in comparison to (1/12)th part of the mass of one atom of carbon-12.
Usually the mass number of an atom is the sum of number of protons and number of neutrons. But the actual mass or average atomic mass is not calculated in this way.
The actual mass is determined using mass spectroscopy. The relative atomic mass of every element is computed based on the mass of C-12 obtained from spectroscopic technique.
Thus the relative atomic mass of boron is calculated in a similar way and it is 9 amu.
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Calculate the theoretical yield of acetylsalicylic acid if excess acetic anhdride and 3.50 grams of salicylic are used in the reaction:
When multiplied by salicylic acid's molecular weight of 1 80.158, it will be equal or smooth. If we compute it now, we will see that the mask, or theoretical yield, is equal to $4.57 million.
Acetylsalicylic AcidAspirin, also known as acetylsalicylic acid (ASA), works by permanently blocking the platelet cyclooxygenase (COX) enzyme, which in turn prevents the production of the platelet thromboxane A2 (TXA-2). A medication called aspirin (acetylsalicylic acid) is used to treat pain or inflammation1. 3 As a non-steroidal anti-inflammatory medicine, it is categorized (NSAID). Pain that is mild to moderate can be treated with aspirin. However, safety concerns regarding the danger of bleeding as well as the possibility of developing a rare but serious liver and brain condition, most commonly in youngsters (Reye's syndrome), should be taken into account.To learn more about Acetylsalicylic Acid refer:
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The table below shows the densities of the elements in Group 0 of the periodic table. Noble Gas helium neon argon krypton xenon radon Density (kg/m³) 0.2 0.9 1.8 3.7 5.9 9.7 Use the data from the table to draw a graph to show the trend in density as you move down Group 0.
The graph below shows the densities of the elements in Group 0 of the periodic table.
What is periodic table?
The chemical elements are shown in tabular form on the periodic table, commonly referred to as the periodic table of the (chemical) elements. It is frequently used in physics, chemistry, and other sciences and is frequently regarded as a symbol of chemistry. It is a visual representation of the periodic law, which claims that the atomic numbers of chemical elements have a roughly periodic relationship with their attributes. The table is divided into four blocks that are about rectangular in shape. The table's columns are referred to as groups and its rows are known as periods.
The trend in density is that the density increases as you move down Group 0. This is because the elements in Group 0 are all noble gases. The noble gases are all gases at room temperature and pressure. The reason for this is that the noble gases all have full outer shells of electrons. This means that the attractive forces between the nuclei and the electrons are very weak. The noble gases are all very unreactive because of this. The reason that the density increases as you move down Group 0 is because the atoms get larger as you move down the group. The larger the atom, the more massive it is. This means that the atoms are more likely to collide with each other, and so the density of the gas increases.
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consider the reaction when aqueous solutions of chromium(ii) sulfate and calcium nitrate are combined. the net ionic equation for this reaction is:
Molecular equation:
CrSO4(aq) + Ca(NO3)2 (aq) —> Cr(NO3)2(aq) + CaSO4(s)
Net ionic:
Ca2+(aq) + SO4(aq) —> CaSO4(s)
A balanced equation is another name for a chemical equation. Any ionic substances or acids are represented as neutral compounds in a molecular equation using their chemical formulae. Following the formula are parenthesis that describe each substance's condition.
A net ionic equation is often constructed using the fewest integer values for the stoichiometric coefficients. As a result, in order to obtain the net ionic equation's final form, it may occasionally be necessary to divide all of the stoichiometric coefficients by a single factor.
The spectator ions are also included in a complete ionic equation, whereas a net ionic equation just displays the chemical species that are engaged in a process. We are able to determine the net ionic equation for a specific
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What is the reaction classification of the above reaction? A2B (l) → A2 (g) + B2 (g)
The reaction classification of the reaction, [tex]A_2B (l) -- > A_2 (g) + B_2 (g)[/tex], is a decomposition reaction.
What is a decomposition reaction?In chemistry, a decomposition reaction is one in which a compound or a reactant decomposes to produce two or more chemically unique substances as the products.
Thus, a typical decomposition reaction can be written as:
AB ---> A + B
Decomposition reactions are the opposite of combination reactions. In combination reactions, two or more reactants combine to form a single product. A combination reaction can be written as:
A + B ---> AB
Considering the reaction in question: [tex]A_2B (l) -- > A_2 (g) + B_2 (g)[/tex]
[tex]A_2B[/tex] is the reactant. It undergoes a reaction to produce [tex]A_2[/tex] and [tex]B_2[/tex] respectively. In other words, the reaction is a decomposition reaction.
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What is the main idea of the excerpt chemistry in centuries
The main idea of the excerpt chemistry in centuries is all the matter present are composed of the atoms.
Aristotle declared that only four element exist in nature. They are -
Air, water, earth, fire.
He stated that all matter are composed of these four elements only.
When the atoms reacts, they form a chemical bond. It is defined as a force of attraction which holds the atoms together to form a compound.
Force of attraction is defined as a type of force which keeps two or more objects close to each other, or together no matter how far or close they are in distance.
Two major categories of forces of attraction are - intramolecular forces and intermolecular forces. Intramolecular is the type of forces in atoms which are present internally. While intermolecular is the type of force which is present in two or more elements.
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Which reaction is responsible for the production of lipids when glycerol is bonded to three fatty acids by the removal of a water molecule? question 10 options: dehydration synthesis hydrolysis hydrophilic hydrophobic
Dehydration Synthesis is the reaction which is responsible for the production of lipids when glycerol is bonded to three fatty acids by the removal of water molecule.
Dehydration synthesis is the creation of larger molecules from smaller monomers and a removal of water molecule takes place .This type of reaction is also classified as condensation reactions.
During this process, the hydrogen of one monomer combines with the hydroxyl group of another monomer releasing a molecule of water. In the attached image, glycerol and fatty acid combine to release water and a lipid molecule is formed.
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PLEASE HELP SOON AS POSSIBLE!!!! I have points and Brainly
■ what quantity of heat is required to raise the temperature of 50.00 ml of water from 25.52 °c to 28.75 °c? the density of water at this temperature is 0.997 g/ml.
Answer:
So in this problem, were asked to calculate how much heat is required to raise the temperature of a certain amount of water from 25.52 degrees Celsius to 28.75 degree Celsius. So let's start with our equation that relates are variables que which is he is equal to mass proof. That is a rough em mass time specific heat times the change in temperature. So we're looking for heat and mass. We do not have mass, but we do have both the density and the volume of water. And so to find mass weaken knew our 50 milliliters that were given in the problems them times the density of water which is point nine 97 grams for one Miller Leader, Let me fix this night up here seven is well, that is our mess. Variable. We know just from looking at the table 6.1 in the chapter that the specific heat of water is four 0.184 Jules per gram killed in and finally we know that the change in temperature just gonna switch this down. Here is the final temperature 28 0.75 degrees Celsius minus our initial temperature, 25 0.52 degrees Celsius. And we can just plug this into a calculator really quickly. 28 2.75 I'm just going to start on this side of the equation. So the change in temperature is 3.23 degrees Celsius. Times are specific. Heat 4.184 and then times are mass, which is 50 times 500.997 And we get our final answer of 600 73 point.
carbonic anhydrases are a class of that catalyze . please choose the correct answer from the following choices, and then select the submit answer button. answer choices
Carbonic anhydrases are a class of zinc containing enzymes that catalyze the conversion of carbon dioxide into bicarbonate ions.
Carbonic anhydrases are a kind of enzyme that catalyzes the interconversion of carbon dioxide, water, and carbonic acid dissociated ions. Most carbonic anhydrases have a zinc ion in their active site. As a result, they are classed as metalloenzymes. Carbonic anhydrase is an enzyme that aids in the quick interconversion of carbonic acid, protons, and bicarbonate ions from carbon dioxide and water.
Carbonic anhydrase is present in the blood, gastrointestinal mucosa, and a trace amount in plasma. Carbonic anhydrase enzymes catalyze the conversion of water and carbon dioxide to carbonic acid dissociated ions. This results in the formation of bicarbonate anions, which dissolve in the blood plasma.
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A molecule that organisms get from the air or water around them is
Raiderium (Cv) has three naturally occurring isotopes. Raiderium is 74.655% 44^Cv, which has an atomic mass of 4.064 amu, 24.958% 46^Cv, which has a mass of 46.125 amu, and 0.387% 48^Cv, which has an atomic mass of 47.982 amu. Calculate the average atomic mass of Raiderium. Please show your work.
I really need help on this one it’s a major part of my grade and I’m super stuck. I’ll mark brainliest answer if it’s correct. Thank you SO MUCH in advance.
The average atomic mass of Raiderium = 43.847amu
Average atomic mass = f1M1 + f2M2 + f3M3
where,
f is the fraction representing the natural abundance of the isotope
M is the mass number (weight) of the isotope.
(0.74655)(43.064amu) + (0.24958)(46.125amu) + (0.00387)(47.982amu) = 43.847amu
What is at Atomic Mass ?
Atomic mass (ma or m) is the mass of an atom. Although the SI unit of mass is the kilogram (symbol: kg), atomic mass is often expressed in the non-SI unit Dalton (symbol: Da) – the equivalent of the unit atomic mass unit (u). 1 Da is defined as 1⁄12 of the mass of a free carbon-12 atom at rest in the ground state. Protons and neutrons in the nucleus make up almost all of the total mass of atoms, and the ratio of electron binding energy and nuclear force is small. Thus, the numerical value of atomic mass expressed in Daltons is almost the same as the mass number.
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How do I find an the isotope?
Among the given isotopes, ³⁰X₁₅ and ³¹X₁₅ are isotopes of the same element and that element is phosphorous.
What is an isotope?Isotopes are those atoms of an element that contains the same atomic number but a different mass number. Isotopes of an element contain an equal number of electrons and protons in their atom but the numbers of neutrons in their respective nucleus are different.
For example, the isotopes of oxygen element are given as oxygen- 16, oxygen - 17, and oxygen-18, these all isotopes have eight protons or electrons.
Given elements are ³⁰X₁₅, ³¹X₁₆, ³¹X₁₅, and ⁶⁰X₃₀. The atoms ³⁰X₁₅ and ³¹X₁₅ have the same atomic number but a different mass number, therefore they are isotopes of the same element. As their atomic number of them is 15 so they are isotopes of phosphorous and ³¹X₁₅ isotope of P has 100 % abundance.
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PLEASE HELP ASAP!!!!! (Show work and explanation please)
Suppose 200.0 g of ice absorb 1255.0 J of heat. What is the corresponding temperature change? Specific heat capacity of ice is 2.1 J/gC.
the answer is 6.0°C that is the solution
What is the nuclide symbol for an atom with 26 protons 31 neutrons and 24 electrons
The nuclide symbol for an atom with 26 protons 31 neutrons and 24 electrons is X⁵⁷₂₆ .
What is Nuclide symbol?This scientific model is expressed in the form ᵃₙX, where a denotes the total number of protons and neutrons and is also referred to as the mass number, n represents the number of protons which is the atomic number.
Since the number of proton given is 26, then n which is the atomic number is 26. The mass number is the total number of protons and neutrons.
26 + 31 = 57.
Since therefore means that a which is the mass number is 57.
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The function group COOH is found in 1) esters 2)aldehydes 3)alcohols 4) organic acids
The functional group with the COOH setting is called Carboxylic acid, which is a type of organic acid, whereas Esters will have COOR representation, Aldehydes wl l be OCH and Alcohols OH, therefore the answer will be number 4
If you have a liquid that you suspect might be a mixture explain what you might do to find out if it is.
Answer:
add a substace devider
Explanation:
i forgot what it was called but there is a chemical that allows the substances to seperste and than you can test the substaces ph and what it is
Which phase is a good description of kinetic energy?(1 point)
conserved energy
energy from the sun
energy of motion
stored energy
Answer: Energy of motion :)
Answer: the answer to your question is the energy of motion
Explanation:
Raquel would like to describe the observable properties of water. What properties can she use?
A Colorless and rough
B Colorless and smooth
C Smooth and rough
D Soft and smooth
HELP ASAP
Answer:
b
Explanation:
water is generally transparent and smooth to the touch unless it is frozen, then it is rough
tin has 10 stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occurring tin atoms. how many atoms of 124sn are present in 23.0 g of naturally occurring tin?
Atoms of 124sn are present in 23.0 g of naturally going on the tin: The average atomic mass of Sn is 118. seventy-one g/mole percentage.
This is explained as the Atomic mass of Tin (Sn) = 118.71 g/mol. 1 mol of Sn = 118.71 g.
An atom is the smallest unit of everyday count that bureaucracies a chemical detail. each solid, liquid, gas, and plasma consists of neutral or ionized atoms. Atoms are extraordinarily small, commonly around one hundred picometers throughout.
An atom is a particle of count that uniquely defines a chemical detail. An atom includes a principal nucleus that is surrounded by one or extra negatively charged electrons. Atoms are built of two kinds of elementary particles: electrons and quarks. Electrons occupy an area that surrounds an atom's nucleus. each electron has an electrical rate of -1. Quarks make up protons and neutrons, which, in flip, make up an atom's nucleus.
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Is more or less heat needed to raise the temperature of 30 grams of gold from 25°C to 50°C compared to the 10 grams of water?
Answer:55*
Explanation:55*
the endpoint of the complexometric titration occurs when the solution color changes from yellow to select one: colorless absence of any green or yellow color. purple green pink
The colour of Variamine blue salt B, a redox indicator changes from yellow to colourless at the endpoint of the complexometric titration indicating alkalinity.
Complexometric titration (also known as chelatometry) is a type of volumetric analysis in which the creation of a coloured complex is utilized to determine the titration's end point. Complexometric titrations are extremely useful for estimating the concentration of a metal ion mixture in solution. EDTA, or ethylenediaminetetraacetic acid, is a frequent indicator for complexometric titration because it may function as a ligand, binding to coordination centers, which are generally metals, to produce colourful complexes. Organic dyes are the most commonly used indicators in complexometric titrations because they generate a colourful complex with the metal ion being titrated. EDTA replaces the indicator during the reaction to create a more stable complex with metal, and when the reaction is through, the colour changes.
The alkalinity of solution is indicated by a colour change from yellow to colourless in the complexometric titration using Variamine blue salt B as the indicator.
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