1. 3 L of NO reacts with O2 at STP. How many moles of NO2 is liberated?

2NO(g) + O2(g) → 2 NO2(g)

a. 5L NO2

b. 4L NO2

c. 6L NO2

d. 3L NO2

2. How many liters of CO2 are produced when 3.46 Fe2O3 is converted to cast Fe at STP?

Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g)

a. 3.45 L

b. 1.45 L

c. 2.45 L

d. 4.45 L

3. Calculate the pressure exerted by 0.28 g of sulfur hexafluoride (SF6), a colorless, odorless, non-flammable, extremely potent greenhouse gas, in a 5.43 L steel vessel at 69.5°C.

a. 0.0098 atm

b. 0.0198 atm

c. 0.0398 atm

d. 0.0298 atm

4. A balloon has a pressure of 2.05 atm and at 28°C. If the temperature is reduced to 16°C, what will be the new pressure of the balloon?

a. 3.97 atm

b. 1.97 atm

c. 2.97 atm

d. 4.97 atm

5. Calculate the mass of 3.45 L SO2 at STP.

a. 9.85 g

b. 7.85 g

c. 6.85 g

d. 8.85 g