Answers

1. Given each of the following set of values for three of the gas variables, calculate the unknown quantity.

a. P= 21.2 atm; V=142 mL; n=0.432 mol; T= ? K

T= 84.9 K

b. P= ? atm ; V= 1.23 mL ; n=0.000115 mol ; T= 293 K

P= 2.25 atm

c. P= 755 mmHg; V=? mL ; n=0.473 mol ; T= 131 C

V= 15.8 L

2. What is the pressure inside a 10.0 L flask containing 14.2 g of N₂ at 26 C?

P= 1.24 atm

3. Suppose three 100. L tanks are to be filled separately with the gases CH₄, N₂, and CO₂, respectively. What mass of each gas is needed to produce a pressure or 120. atm in its tank at 27 C?

487 mol gas needed

Mass of CH₄= 7.79 kg

Mass of N₂ = 13.6 kg

Mass of CO₂ = 21.4 kg

4. At what temperature does 4.00 g of helium gas have a pressure of 1.00 atm in a 22.4 L vessel?

T= 273 K