An Ideal Gas Composed of Helium Atoms Is at a Pressure

Multiple Choice

An ideal gas composed of helium atoms is at a pressure of 2.00 atmospheres and a temperature of 35.0°C. What is the mass density? (He = 4.00 u)

A) 0.534 kg/m³
B) 0.488 kg/m³
C) 0.400 kg/m³
D) 0.316 kg/m³
E) 0.276 kg/m³