An Ideal Gas Composed of a Mixture of Oxygen and Nitrogen

Multiple Choice

An ideal gas composed of a mixture of oxygen and nitrogen is at a pressure of 1.50 atmospheres and a temperature of $25.0^{\circ} \mathrm{C}$ . What is the molar density?

A) $40.0 \mathrm{~mol} / \mathrm{m}^{3}$
B) $55.5 \mathrm{~mol} / \mathrm{m}^{3}$
C) $79.3 \mathrm{~mol} / \mathrm{m}^{3}$
D) $47.6 \mathrm{~mol} / \mathrm{m}^{3}$
E) $61.3 \mathrm{~mol} / \mathrm{m}^{3}$