Question

Choose the correct option for the total pressure (in atm.) in a mixture of $4 \,g\, O _{2}$ and $2 \,g \,H _{2}$ confined in a total volume of one litre at $0^{\circ} C$ is : $\left[\right.$ Given $\left.R = 0.082 \,L \,atm\, mol ^{-1} K ^{-1}, T =273\, K \right]$

• A. $2.518$
• B. $2.602$
• C. $25.18$
• D. $26.02$

Answer 1

Answer: (C)

$n = n _{ O _{2}}+ n _{ H _{2}}$
$n =\frac{4}{32}+\frac{2}{2}$
$n =\frac{9}{8}$
$P =\frac{ nRT }{ V }$
$P =\frac{9}{8} \times \frac{0.0821 \times 273}{1}$
$=25.18\, atm$