Ideal Gas Law: What Is the Mass Density of Argon

Ideal gas law: What is the mass density of argon gas at pressure 1.00 × 10⁵ N/m² and at temperature 300 K? The mean atomic mass of argon is 39.948 g/mol and the ideal gas constant is R = 8.314 J/mol ∙ K = 0.0821 L ∙ atm/mol ∙ K.

A) 1.40 kg/m³
B) 1.00 kg/m³
C) 1.20 kg/m³
D) 1.60 kg/m³
E) 1.80 kg/m³