Answer: The molar mass of X is 61.3g/mol
Explanation:
Depression in freezing point is given by:
[tex]\Delta T_f=K_f\times m[/tex]
[tex]\Delta T_f=T_f^0-T_f=(6.55^0C-5.9^0C)=0.65^0C[/tex] = Depression in freezing point
[tex]K_f[/tex] = freezing point constant = [tex]20.2^0C/mol[/tex]
m= molality = [tex]\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Mass of solvent in Kg}}[/tex]
where,
Now put all the given values in this formula, we get
[tex]0.65^0C=20.2°C/m\times frac{0.148g}}{M\times 0.075kg}[/tex]
[tex]M=61.3g/mol[/tex]
Thus molar mass of X is 61.3g/mol
The pH of a solution can be calculated using which formula?
Answer:
The formula for calculating pH is pH=−log[H_3O+ ]
pH is the negative logarithm (to base 10) of hydronium ion concentration
The pH Formula can also be expressed as
PH= - log[H+ ]
Calculate the pH of a solution with [H+] = 1.8 x 10^-5 M
Answer:
4.74
Explanation:
pH= -log[H+]
pH= -log(1.8 x 10^-5)= 4.74
calculate the mass of butane needed to produce 65.5 g of carbon dioxide
You take the mass of carbon dioxide, 56.8g, divide by its molar mass, 44.01g/mol, to produce the moles of carbon dioxide. This is multiplied by the molar ratio of butane/CO2, (2/8) = 1/4, which gives the moles of butane required to produce the carbon dioxide.
The mass of a substance is the product of the moles and the molar mass. 65.5 g of carbon dioxide will be able to produce 21.62 grams of butane.
What is mass?The mass of a reactant or a product is estimated by the number of moles and the molar mass of the substance.
The combustion reaction of methane is shown as,
2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O
Given,
Molar mass of butane = 58.12 g/mol
Mass of carbon dioxide = 65.5 g
Molar mass of carbon dioxide = 44.01 g/mole
Moles of carbon dioxide are calculated as,
Moles = mass ÷ molar mass
= 65.5 ÷ 44.01
= 1.488 moles
From the above reaction, two moles of butane produce eight moles of carbon dioxide. So, 1.488 moles of carbon dioxide will be produced from,
2 × 1.488 ÷ 8 = 0.372 moles
The moles of butane required is 0.372 moles
The mass of butane from moles is calculated as,
Mass = moles × molar mass
= 0.372 × 58.12 g/mole
= 21.62 gms
Therefore, 21.62 gm of butane is required to produce 65.5 g of carbon dioxide.
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Which process directly moves nutrients from plants to animals?
A. Feeding
B. Breathing
C. Photosynthesis
D. Mineralization
Answer:
Dude its A.Feeding
Explanation:
Its common scene that when u eat you are getting nutrient directly from the food. Come on Sponge Bob Me Boy
what conditions are needed to prevent iron from rusting?
A sample of nitrogen gas is stored in a 0.500 L flask at 101.3 atm. The gas is transferred to a 0.750
L flask. What is the pressure of nitrogen in the second flask if the temperature remains constant?
Answer:
67.5 atm
Explanation:
To answer this problem we can use Boyle's law, which states that at constant temperature the pressure and volume of a gas can be described as:
P₁V₁=P₂V₂
In this case:
P₁ = 101.3 atm
V₁ = 0.500 L
P₂ = ?
V₂ = 0.750 L
We input the data:
101.3 atm * 0.500 L = P₂ * 0.750 L
And solve for P₂:
P₂ = 67.5 atm
7. Indicate if the following are correct or incorrect.
1s2
6s3
5f10
4d3
2d4
3p10
Answer:
1s2: correct.
6s3: incorrect because the subshell s can hold up to 2 electrons.
5f10: correct.
4d3: correct.
2d4: incorrect because the second energy level just has the s and p subshells.
3p10: incorrect because the p subshell can hold up to 6 electrons.
Explanation:
Hello there!
In this case, according to the attached file, which shows the correct orbitals and electrons, we can proceed as follows:
1s2: correct.
6s3: incorrect because the subshell s can hold up to 2 electrons.
5f10: correct.
4d3: correct.
2d4: incorrect because the second energy level just has the s and p subshells.
3p10: incorrect because the p subshell can hold up to 6 electrons.
Best regards!
Many tall trees grow in a forest. Only a few small plants grow underneath the trees. Why is this so?
Answer:
Because as more and more trees are tall, they end up blocking the sun to the smaller vegetation and so many plants end up dying or they evolve to grow taller and taller as a way to stay alive.
Explanation:
What are the 4 different materials that come together to make up a bone?
Answer:
calcium, mineral hydroxyapatite, protein collagen and the tough fibrous component of tendons and ligaments
Explanation:
hope this helps :)
the name of the acid present in milk
Answer:
lactic acidThe real acidity of milk is due to lactic acid. This is never found in milk when it is first drawn from the udder. It is produced by the action of the lactic acid organisms on the milk sugar. The so-called apparent acidity of milk is what gives fresh milk its acid reaction.
Think about a single cell and its parts; for example, think about a cell inside the human body. Now, select an everyday object that could be used as a model for a cell and its parts. In words and/or pictures, describe your model and how it is like the cell.
Answer:
Mitochondria
Hydraulic Dams
Ribosomes
Small Shops
Nucleus
Town Hall
Endoplasmic Reticulum
Railroad Tracks
Golgi Bodies
Post Office
Cytoplasm
Clean Air and Water
Protein
Widget
Cell Membrane
Fence
Lysosomes
Scrap Yard
Nucleolus
Carpenter's Union
Vacoule
Warehouse
here is some ideas
2. How many chlorine atoms are in 4 moles of chlorine?
Answer:
4
Explanation:
The half-cell is a chamber in the voltaic cell where one half-cell is the site of the oxidation reaction and the other half-cell is the site of the reduction reaction. Type the half-cell reaction that takes place at the anode for the cobalt-silver voltaic cell. Indicate the physical states using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively. Use (aq) for an aqueous solution. Do not forget to add electrons in your reaction.
Answer: Anode : [tex]Co(s)\rightarrrow Co^{2+}(aq)+2e^-[/tex]
Cathode : [tex]Ag^+(aq)+e^-\rightarrrow Ag(s)[/tex]
Explanation:
Electrochemical cell is a device which is used for the conversion of the chemical energy produces in a redox reaction into the electrical energy.
The standard reduction potential for cobalt and silver are as follows:
[tex]E^0_{Ag^+/Ag}=+0.80V[/tex]
[tex]E^0_{Co^{2+}/Co}=-0.277V[/tex]
Reduction takes place easily if the standard reduction potential is higher (positive) and oxidation takes place easily if the standard reduction potential is less (more negative).
Here Co undergoes oxidation by loss of electrons, thus act as anode. Silver undergoes reduction by gain of electrons and thus act as cathode.
Anode : [tex]Co(s)\rightarrrow Co^{2+}(aq)+2e^-[/tex]
Cathode : [tex]Ag^+(aq)+e^-\rightarrrow Ag(s)[/tex]
Overall reaction : [tex]Co(s)+2Ag^+(aq)\rightarrrow Co^{2+}(aq)+2Ag(s)[/tex]
what do you understand by atomic theory
Answer:
Explanation:
All material substances are composed of minute particles or atoms of a comparatively small number of kinds and all the atoms of the same kind are uniform in size, weight, and other properties.
Hope this helped!!
Answer:
Atomic theory states that matter is composed of particles called atoms.
Explanation:
According to the theory, all types of matter can be divided into smaller parts, to the point it's indivisible.
An atom can be defined as the basic particle that composes a chemical element.
John Dalton's Atomic Theory:
All matter is made of atoms, which are indivisible.All atoms of a given element are identical in mass and properties.Compounds are combinations of two or more different types of atoms. A chemical reaction is a rearrangement of atoms.Dalton's theory was further modified by the discovery of sub-atomic particles, like the electrons, neutrons and protons.
If 0.8675 g of KHP requires 24.56 mL of an NaOH solution to reach the equivalence
point in the titration, what is the concentration of the NaOH?
Answer:
[tex]M_{base}=0.173M[/tex]
Explanation:
Hello there!
In this case, since the titration of acids like KHP with bases like NaOH are performed in a 1:1 mole ratio, it is possible for us to know that their moles are the same at the equivalence point, and the concentration, volume and moles are related as follows:
[tex]n_{acid}=M_{base}V_{base}[/tex]
Thus, by solving for the volume of the base as NaOH, we obtain:
[tex]M_{base}=\frac{n_{acid}}{V_{base}} \\\\M_{base}=\frac{0.8675g*\frac{1mol}{204.22g} }{0.02456L} \\\\M_{base}=0.173M[/tex]
Best regards!
When doing the experiment where you compress the air in the syringe, you are collecting 5 data points. Each time you are to decrease the volume by _____ mL
This question is incomplete, the missing diagram is uploaded along this question below.
Answer:
Each time you are to decrease the volume by 4 mL
Explanation:
From the image, we can see that the volumes of each syringes are displayed;
the first syringe reads 22
the second syringe reads 18
the third syringe reads 14
the fourth syringe reads 10
and the fifth syringe reads 6
Thus, if we notice the consecutive reading on the syringes, we will notice that each successive step reduces the volume by 4 mL
Therefore, Each time you are to decrease the volume by 4 mL
Why is soap able to break down oils and fats?
Answer:
When you build up a soapy lather, the molecules help lift the dirt, oil and germs from your skin
Explanation:
Soap molecules have one end that bonds with water and the other end that bonds with oils and fats .
Hope this helped!!
more reactive material can help to stop iron rusting true or false
Answer: Galvanising is a method of rust prevention. The iron or steel object is coated in a thin layer of zinc. This stops oxygen and water from reaching the metal underneath - but the zinc also acts as a sacrificial metal . Zinc is more reactive than iron, so it oxidises in preference to the iron object.
Explanation:
Hey can someone pls help me answer these questions? It should be easy maybe. It’s just science. The question just won’t to know where you would put the arrow above to show the motion of the plates. Where would I put it?
how can CN carry negative charge
Answer:
Cyanide contains two atoms having carbon and nitrogen. Which are bonded through two two pi and one sigma bond by sharing of the electron . As a result one lonepair of electron remains in Cyanide. Hence Cyanide have a negative charge.
Explanation:
#sashaVishwanath had some money. he spent 3 upon 4 part of money to buy goods for his birthday,1 upon 5 part of money give to his sister and the rest of Rs.40 to mother how much did he have at first
Answer:
The correct answer is - 800.
Explanation:
Given:
Total amount = ? or assume x
spend in buying birthday item = 3/4 of x
given to sister = 1/5 of x
remaining to mother = 40
solution:
the remaning amount = x- (3x/4+x/5) = 4=
=> x- 19x/20 = 40
=> x = 20*40
=> x = 800
thus, the correct answer is = 800
Question 6 of 30 Carbon dioxide subliming is an example of which of the following?
Answer:
dry ice or solid carbon(iv)oxide
Explanation:
carbon(iv)oxide that sublimes is known as dry ice or solid CO2 and it is used to refrigerate food instead of ordinary ice which will just melt when exposed to hot conditions and there4 will lead to the destruction of food. dry ice will sublime the moisture from the food there4 keeping out any moisture
how many grams of ammonia produced from 1000 grams of N2?
Answer:
N2 + 3H2 ———> 2NH3
As we know 1000 grams ammonia is 58.82 moles so according to unitary method,
2 mole NH3 formed by 1 mole N2 hence 58.82 NH3 will be given by 29.41 moles N2.
No. Of moles = given mass/molar mass
Implies that
Mass of nitrogen required = 29.41*28 = 823.48 grams.
Explanation:
A jet is goes from 180km/s to 139km/s in 22 seconds. What is it's acceleration?
14. V=
15. Vp =
16. t=
17a=
What type of ions have names ending in -ide?
O only cations
O. only anions
O only metal ions
O only gaseous ions
Answer:
Only anions
Explanation:
Polyatomic positive ions often have common name ending with the suffix anions
Arenediazoniums can undergo electrophilic aromatic substitutions with a wide variety of activated aromatic compounds to yield new azo dyes.
a. True
b. False
Graphite is one of the allotropes of carbon
a) Define the term allotropy
b) Identify the other allotrope of carbon
c) State two uses of graphite
Answer:
When an element exists in more than one crystalline form, those forms are called allotropes; the two most common allotropes of carbon are diamond and graphite. Every carbon atom is covalently bonded at the four corners of the tetrahedron to four other carbon atoms.
3 Zn + 2 H3PO4 → 3 H2 + Zn3(PO4)2
How many grams of Zn are needed in order to produce 0.15 g of H2?
Answer: 4.87 g
Explanation:
We know that for every 3 moles of zinc that are consumed, 3 moles of hydrogen are produced (we can reduce this to the number of moles of zinc consumed = moles of hydrogen produced)
We know that the formula mass of hydrogen is 2(1.00794)=2.01588 g/mol, so in 0.15 g, there is about 0.15/2.01588 = 0.074409191023275 moles.
This means that about 0.074409191023275 moles of zinc are needed, and since the atomic mass of zinc is 65.409 g/mol, the answer is (0.074409191023275)(65.409)=4.87 g
A solution is prepared by dissolving 0.23 mol of hypochlorous acid and 0.27 mol of sodium hypochlorite in water sufficient to yield 1.00 L of solution. The addition of 0.05 mol of HCl to this buffer solution causes the pH to drop slightly. The pH does not decrease drastically because the HCl reacts with the ________ present in the buffer solution. The Ka of hypochlorous acid is 1.36 × 10-3.
Answer:
hypochlorite ion
Explanation:
The hypochlorous acid, HClO, is a weak acid with Ka = 1.36x10⁻³, when this acid is in solution with its conjugate base, ClO⁻ (From sodium hypochlorite, NaClO) a buffer is produced. When a strong acid as HCl is added, the reaction that occurs is:
HCl + ClO⁻ → HClO + Cl⁻.
Where more hypochlorous acid is produced.
That means, the HCl reacts with the hypochlorite ion present in solution
How many molecules of carbon tetrafluoride, CF4, are in 176 grams of CF4?
Answer:
1.2*10^24 molecules of CF4
Explanation:
the molar mass of cf4 is 88.0043 g/mol
176/88.0043 = 2 moles of CF4
Then multiply by avogadro's number (6.022*10^23) to get the number of molecules
2*6.022*10^23 = 1.2*10^24 molecules of CF4
There are 1.204 × 10²⁴ molecules of carbon tetrafluoride in 176 grams of CF4.
HOW TO CALCULATE NUMBER OF MOLECULES:
The number of molecules in a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number:no. of molecules = no. of moles × 6.02 × 10²³The number of moles in CF4 can be calculated as follows:moles of CF4 = mass of CF4 ÷ molar mass of CF4. Molar mass of CF4 = 12 + 19(4)Molar mass of CF4 = 88g/molmoles of CF4 = 176g ÷ 88g/molmoles of CF4 = 2molNo. of molecules = 2 × 6.02 × 10²³no. of molecules = 12.04 × 10²³no. of molecules = 1.204 × 10²⁴ Therefore, there are 1.204 × 10²⁴ molecules of carbon tetrafluoride in 176 grams of CF4.Learn more at: https://brainly.com/question/11815186?referrer=searchResults