Question

At 380 mm of Hg pressure and $0^{o}C$, the number of moles of gas present in 11.2 litres are:

• A. $0.20$
• B. $0.25$
• C. $0.39$
• D. $0.33$

Answer 1

The correct option is B $0.25$

$n=\frac{PV}{RT}$

$P=\frac{380}{760}=0.5atm$

$T=273K$

$V=11.2L$

$n=\frac{0.5\times 11.2}{0.082\times 273}=0.25moles$

Hence, option B is correct.