Question

The total pressure of a mixture of $8$ g of oxygen and $14$ g of nitrogen contained in a $11.2$ L vessel at $0^{\circ }$ is:

• A. $0$ atm
• B. $0.5$ atm
• C. $1.5$ atm
• D. $2$ atm

Answer 1

The correct option is C $1.5$ atm

No. of moles of oxygen $=\frac{8}{32}=0.25$

No. of moles of nitrogen $=\frac{14}{28}=0.5$

Volume of the container = 11.2 Litre

Temperature = 0°c or 0+ 273 = 273 K
Assuming ideal gas behavior,

$P=\frac{nRT}{V}$

$=\frac{0.75\times 0.0821\times 273}{11.2}$

$=1.501atm$