Question

A sample of neon gas is contained by a closed 4-litre vessel. The temperature of container is 25 ${}^{o}C$ and pressure is 1.5 atmospheres. (The gas constant, $R$, is equal to 0.08 $Latm/mol/K$).
Neon gas in the vessel is replaced with an equal molar quantity of helium gas. Which of the following properties of the gas in the container will be changed?
I. Pressure
II. Temperature
III. Density

• A. I only
• B. II only
• C. III only
• D. I and II only
• E. II and III only

Answer 1

The correct option is C III only

Only density will change. Pressure and temperature will remain same. Density will depend on molar mass as number of moles and volume are constant. Pressure and temperature will depend only on volume and number of moles which are same for both gases.