1nbspa gas occupies 30 l at 20 atm pressure and

Question

1. A gas occupies 30. L at 2.0 atm pressure and 27°C, How many moles of gas are present in the sample?

2. Which of the following should have the lowest boiling point?

A. C₄H₁₀

B. C₃H₈

C. C₂H₆

D. C₅H₁₂

_{E. CH4}

 

3. An oxygen sample has a volume of 4.50 L at 27°C and 800.0 torr. How many oxygen molecules does it contain?

4. The molar heat of fusion of water is 6.02 kJ/mol. Calculate the energy required to melt 3.00 mol of ice

A. 12.0 kJ

B. 6.02 x 10^23 kJ

C. 18.1 kJl

D. 2.01 kJ

E. None of these

5. A gas occupies 30. L at 2.0 atm pressure and 27°C.

Calculate its volume if the pressure is decreased to 1.0 atm at constant temperature.

A.120 L

B. 45 L

C. 60 L

D. 15 L

E. 79 L

 

6. Determine the pressure exerted by 1.80 mol of gas in a 2.92 L container at 32°C

A. 15.4 atm

B. 22.4 atm

C. 1.62 atm

D. 495 atm

E. 8.57 atm

 

7. 1.6 ´ 10⁵ torr = ______________ atm

 

8. Calculate the quantity of energy required to change 26.5 g of liquid water to steam at 100°C. The molar heat of vaporization of water is 40.6 kJ/mol.

A. 27.6 kJ

B. 1.53 kJ

C. 1.08 ' 10³ kJ

D. 59.8 kJ

E. None of the above