Question

$56g$ of nitrogen and $96g$ of oxygen are mixed isothermally at a total pressure of $10atm$. The partial pressures of oxygen and nitrogen (in $atm$) are ______ respectively.

• A. $4,6$
• B. $5,5$
• C. $2,8$
• D. $6,4$
• E. $5,4$

Answer 1

The correct option is A $4,6$

$n_{N_2}=\frac{56}{28}=2;n_{O_2}=\frac{96}{32}=3$
$P_{N_2}=x_{N_2}\times P_{Total}$
$=\frac{2}{2+3}\times 10=4atm$,
$P_{O_2}=10-4=6atm$.