**Q1: **

On a warm day when the air temperature is , a metal can is slowly cooled by adding bits of ice to liquid water in it. Condensation first appears when the can reaches . What is the relative humidity of the air?

**Q2: **

Air is oxygen.

Find the minimum atmospheric pressure that gives a relatively safe partial pressure of oxygen of 0.16 atm.

What is the minimum pressure that gives a partial pressure of oxygen above the quickly fatal level of 0.060 atm?

**Q3: **

Find the density of air at a pressure
of 1.00 atm and a temperature of , assuming that air is N_{2}, O_{2}, and Ar.

Find the density of the atmosphere on Venus, assuming that the atmosphere is
CO_{2} and N_{2}, with a temperature of 737 K and a
pressure of 92.0 atm.

**Q4: **

Per mole, the atmosphere of a planet consists of nitrogen,
oxygen, and hydrogen. In modeling the
planet’s atmosphere, use a value of 28.0 g/mol for the molar mass of N_{2},
32.0 g/mol for the molar
mass of O_{2}, and 2.02 g/mol for the molar mass of H_{2}.

What is the mass of the nitrogen in 1.0 mol of this planet’s atmosphere?

The atmosphere of this planet is mixed with pentane in a ratio of by mass. Find the partial pressure of pentane in this mixture at an overall pressure of 2.50 atm. Use a value of 72.2 g/mol for the molar mass of pentane.

**Q5: **

What are the temperature and pressure of water at the triple point?

- A 0 K and 0.611 kPa
- B 373 K and 101 kPa
- C 273 K and kPa
- D 273 K and 0.611 kPa
- E 173 K and 611 kPa

**Q6: **

In a system, a water vapor mixture is at equilibrium at a temperature of 473 K. What is the pressure of the system?

**Q7: **

A rigid vessel contains water vapor mixture in equilibrium at a pressure of 4.76 MPa. What is the temperature of the system?

**Q8: **

A system contains water at a pressure of 4 MPa and a temperature of . What is the phase of this water?

- ALiquid-vapor mixture
- BVapor
- CSolid
- DLiquid
- ESolid-liquid mixture

**Q9: **

A system contains water at a pressure of 4 MPa and a temperature of . What is the phase of this water?

- ALiquid
- BLiquid-vapor mixture
- CSolid
- DVapor
- ESolid-liquid mixture

**Q10: **

A rigid vessel with a volume of 200 m^{3} contains a saturated liquid-vapor mixture
with a vapor quality of . The temperature of the vessel is maintained
at 393 K. What is the total mass of the
liquid-vapor mixture inside the vessel?