Question

2. If I have an unknown quantity of gas at a pressure of 1.22 atm, a volume of31.5L, and a temperature of 89.5°C, how many moles of gas do I have?

Answer 1

n = 1.29 moles

Step-by-step explanation

Given:

Pressure (P) = 1.22 atm

Volume (V) = 31.5 L

Temperature =89.5 C = 362.5 K

We know R = 0.082 L.atm/K.mol

Required: moles of the unknown gas

Solution:

Use the ideal gas law:

PV = nRT

n = PV/RT

n = (1.22 atm x 31.5 L)/(0.082 L.atm/K.mol x 362.5 K)

n = 1.29 moles