Question

#1: A gas mixture contains 88 grams of oxygen gas, 88 grams of nitrogen gas, and 12 grams of nitrogen dioxide gas. What is the mole fraction of nitrogen dioxide in this mixture?

A. 0.51

B. 0.12

C. 0.04

D. 0.45

**my answer: C. 0.04

is that right?? @chmvijay :)

Answer 1

#2: In the gas mixture containing 88 grams of oxygen gas, 88 grams of nitrogen gas, and 12 grams of nitrogen dioxide gas, what is the mole fraction of nitrogen gas?

A. 0.12

B. 0.45

C. 0.81

D. 0.51

***my answer; D. 0.51

is that right?

Answer 2

#3: Which of the following actions will not increase the rate at which a solid dissolves in a liquid?

A. lowering the temperature of the system

B. stirring the solid and the liquid

C. increasing the amount of the solid

D. increasing the surface area of the solid

***my answer: A. lowering the temperature of the system

is that it?

Answer 3

#4: Which term describes the amount of solute that will dissolve in a specific solvent under given conditions?
A. solution

B. molality

C. molarity

D. solubility

***not too sure... is it B. molality ?? or D. solubility??

Answer 4

#5: What should the mole fractions in a solution add up to?

A. 0

B. 1

C. 0.5

D. 0.1

***my answer: B. 1

is that right??