CHEMISTRY HIGH SCHOOL

Examine the graph below.Choose which of the following is NOT true.

Absolute zero on Kelvin scale is -273°C.
Liquefaction of the gas occurs at approximately -155°C.
Condensation occurs at 0°C.
The gas follows a linear relationship between volume and temperature.
Examine the graph below. Choose which of the following is - 1

Answers

Answer 1
Answer:

Answer : The incorrect option is, Condensation occurs at 0^oC.

Explanation :

Absolute zero on Kelvin scale is -273^oC.

This statement is correct because at 0K the temperature in degree Celsius will be, 0K=0-273=-273^oC

Liquefaction of the gas occurs at approximately -155^oC.

This statement is correct. From the given graph the liquification of gas occurs at -155^oC.

The gas follows a linear relationship between volume and temperature.

This statement is correct. According to the Charles law, the volume of gas is directly proportional to the temperature of the gas. So, gas follow the linear relationship between the volume and temperature.

Condensation occurs at 0^oC.

This statement is incorrect because condensation occurs at 100^oC. and the condensation is a process in which the phase changes from the gaseous state to liquid state at constant temperature.

As we know that condensation is a reverse process of vaporization. Both the process occurs at constant temperature 100^oC.

Hence, the incorrect option is, Condensation occurs at 0^oC.
Answer 2
Answer: Obviously from the graph, the relationship is linear. Charle's laws also say that so that one can be eliminated. Also using the points on the graph, abolute 0 is -273 and liquefication occurs around -155. That sets the answer to Condensation occurs at 0

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Which of the following compounds will experience dipole-dipole forces of attraction? Cl2
NaCl
H2S
C2H4

Answers

NaCl and H2S will experience dipole-dipole interaction because they are permanently polarized.
NaCl and H2s are the answers

If you have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, how much ammonia (in grams) is produced? 3H2 + N2 --> 2NH3

Answers

If we have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, 39.66g ammonia is produced.

What is mole concept?

Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.

No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.

Mass of a particular product is also find out by stoichiometry of a reaction as per the no. of mole given in the reaction.

Given,

3H₂ + N₂ --> 2NH₃

3.50 moles of hydrogen

5.00 moles of nitrogen

Limiting reagent for the reaction is H₂.

3 moles of H₂ produce 2 moles NH₃

1 moles of H₂ produce 2/3 moles NH₃.

3.5 moles of H₂ produce (2÷3)×3.5 moles NH₃ = 2.33 moles

1 mole of NH₃ = 17g of NH₃

2.33 mole of NH₃ = 39.66g of NH₃

Therefore, If we have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, 39.66g ammonia is produced.

Learn more about mole concept, here:

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If you have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, how much ammonia (in grams) is produced?
3H2 + N2 --> 2NH3
 3.5 moles H2 (2 moles NH3/3 moles H2) (17 grams NH3/1 mole NH3) = 40 grams NH3

Which of the following agencies provide research funding that is not federally financed? A. Department of Energy B. National Institute of Health C. National Science Foundation D. American Diabetes Association Choose all that apply

Answers

The answer is d. American diabetes Association

American diabetes association is a non-government organization that was founded in 1940 in order to fight diabetes

They were non profit charity organization providing research for diabetes information

One positive attribute of dietary fat is that it's a good source of A. water.
B. vitamin
c.
C. energy.
D. boron.

Answers

C. energy. 

One positive attribute of dietary fat is that it's a good source of ENERGY


NOT:
A. water. 
B. vitamin
D. boron.
One positive attribute of dietary fat is that it's a good source of C. energy.

What is the volume occupied by 0.108 mol of helium gas at a pressure of 0.909 atm and a temperature of 306 K ? Express your answer using three significant figures. Would the volume be different if the gas was argon (under the same conditions)? The volume would be the lower for argon gas. The volume would be the same for argon gas. The volume would be the greater for argon gas.

Answers

Answer: 2.93 L

Explanation:

AI-generated answer

To find the volume occupied by 0.108 mol of helium gas at a pressure of 0.909 atm and a temperature of 306 K, we can use the ideal gas law equation:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Rearranging the equation to solve for V:

V = (nRT) / P

Plugging in the given values:

n = 0.108 mol

R = 0.0821 L·atm/(mol·K) (the ideal gas constant)

T = 306 K

P = 0.909 atm

V = (0.108 mol * 0.0821 L·atm/(mol·K) * 306 K) / 0.909 atm

Calculating this expression, we find that the volume occupied by 0.108 mol of helium gas at a pressure of 0.909 atm and a temperature of 306 K is approximately 2.93 L.

Now, let's consider the second part of the question: Would the volume be different if the gas was argon (under the same conditions)?

The volume would be the same for argon gas.

According to the ideal gas law, at the same temperature, pressure, and number of moles, the volume occupied by a gas is the same regardless of the gas's identity. Therefore, if we replaced helium gas with argon gas while keeping the same conditions of pressure, temperature, and number of moles, the volume occupied by argon gas would be the same, approximately 2.93 L.

The empirical formula of styrene is CH; its molar mass is 104.1 g/mol. What is the molecular formula of styrene?A) C2H4
B) C8H8
C) C10H12
D) C6H6
E) none of these

i got C8H8 because i did
MWEF=n

but it says the answer should be C2H4

how is that possible?

Answers

You got the answer correct. If you would double check
given:C (12 g/mol) H (1 g/mol). 

12(8) + 1(8) = 104 g/mol

and for C2H4
12(2)+1(4) = 28g/mol

Also, chemical formula of styrene is C6H5CH=CH2.
1. Find the molecular formula of styrene 

Molecular formula = n x empirical formula 

n= 104.14/13.02 = 8 where 13.02 is the empirical mass of CH 

Molecular formula = CH x 8 
= C8H8 

2. From step 1, one molecule of styrene contains 8 atoms of hydrogen or one mole of styrene molecules contains 8 moles of hydrogen atoms (remember the formula of styrene is C8H8). 

3. Convert 3.49 g styrene to mole styrene 

mole styrene = 3.49 g/104.14 g/mol = 4.71 x 10^-3 mole 

4. Calculate mole of hydrogens equivalent to 4.71 x 10^-3 mole styrene. Use mole ratio from step 2. 

mole H = 4.71 x 10^-3 mole styrene * 8 moles H/1 mole styrene 

mole H = 0.0377 mole 

5. Find number of H atoms contained in 0.0377 mole of hydrogen atoms. Use Avogadro's number. 

no. of H atoms = 0.0377 mole H * 6.02 x 10^23 atoms H/1mole H 

no. of H atoms = 2.27 x 10^22 atoms H
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