Question

The mass of 0.5 litre of hydrogen gas at NTP will be approximately

• A. 0.0892 g
• B. 0.045 g
• C. 2 g
• D. 22.4 g

Answer 1

Answer: (B)

0.045 g

$PV=mRT$

Under NTP

$P={10}^{5}N/m,V=0.5L=0.5\times {10}^{-3},T=298K,R=8300/2$

$\Rightarrow {10}^5\times 0.5\times {10}^{-2}=m\times 8300\times 298/2$

$\Rightarrow m=0.042g$