If an unknown quantity of gas is held at a temperature of 789 K in a container with a volume of

22.0 L and a pressure of 765 torr, how many moles of gas are there?

n = 0.34 mol

Explanation:

Given dа ta:

Given temperature = 789 K

Pressure = 765 torr (765/760 = 1.0 atm

Volume of container = 22.0 L

Number of moles of gas = ?

Solution:

Formula:

PV = nRT

n = PV/RT

n = 1.0 atm * 22.0 L / 0.0821 atm. L/mol. K * 789 K

n = 22.0 L. atm / 64.8 atm. L/mol

n = 0.34 mol