Chemistry hw help Ideal gas

Question

Calculate the pressure of a gas having a density of 2.20g/L at 289K having a molar mass of 32g/mol

Answer 1

Assume 1 liter container.

PV = nRT

P = pressure = ?

V = volume = 1 L

n = moles = 2.20 g x 1 mol/32 g = 0.06875 moles

R = gas constant = 0.0821 Latm/Kmol

T = temperature in K = 298

Solve for P:

P = nRT/V = (0.06875)(0.0821)(298) / 1

P = 1.68 atm