Q. A cylinder contains hydrogen gas at pressure of 249 kPa and temperature 27°C. Its density is : (R = 8.3 J $mol^{-1}$ $K^{-1}$)
A) 0.2 kg/$m^3$
B) 0.1 kg/$m^3$
C) 0.02 kg/$m^3$
D) 0.5 kg/$m^3$
Explanation
[Solution] $\rho = \frac{PM}{RT} = \frac{249 \times 10^3 \times 2 \times 10^{-3}}{8.3 \times 300} = 0.2$ kg/$m^3$. The source key gives (2), which is incorrect. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.