115 g of an unknown gas at 47 and 110 atm is stored in a 105

1.15 g of an unknown gas at 47 and 1.10 atm is stored in a 1.05-L flask. What is the density of the gas? Number 1.207 g/L What is the molar mass of the gas? Number 2.88 x 10g/ mol

Solution

Let molar mass of gas is M gm / mole

Ideal gas equation is

PV = nRT

PV = w / M * RT

1.10 * 1.05 = 1.15 / M * 0.0821 * 320

M = 26.16 gm / mole.

molar mass of unknown gas = 26.16 gm / mole.

w / V = M P / RT

w / V = 26.16 * 1.10 / 0.0821 * 320 = 1.095 gm / L

so density is 1.095 gm / L