Question

Calculate the number of moles of hydrogen gas present in $0.5d{m}^3$ sample of hydrogen gas at a pressure of $101.325KPa$ and at ${27}^{o}C$. (Write up to $2$ decimal places)

Answer 1

$PV=nRT$
$101.325KPa=1atm;{27}^{0}C=300K;0.5d{m}^3=0.5L$
$1\ast 0.5=n\ast 0.0821\ast 300$
$n=\frac{0.5}{24.63}=0.02$