NameJ___________________

Homework 5/1/02, 5/2/02

Grade: ________/20

1. Two hot-air balloons envelopes are being inflated on a field. The envelope of balloon A is 1.25 times the volume of envelope of balloon B. At the same temperature and pressure, which balloon will contain the large mass of air after they are both inflated to 75% of capacity? Show your work to get credit!

2. A balloon has a volume of 1.75 L at a temperature of 25°C. What will be the volume of the balloon if you take it out into the cold winter air at -15°C?

3. A gas mixture contains hydrogen, helium, neon, and argon. The total pressure of the mixture in 93.6 kPa. The partial pressures of helium, neon, and argon are 15.4 kPa, 25.7 kPa, and 35.6 kPa, respectively. What is the pressure exerted by hydrogen? Convert your answer to mb!

4. How many kilograms of oxygen (O₂) are contained in an oxygen sample that occupies 505 L at 5.76 atm and 273 K?

5. How many nitrogen molecules are contained in 1.00 L of nitrogen gas at 1.00 atm and 298 K? How many nitrogen atoms?