Question

Pressure of a mixture of 4 g of O₂ and 2 g of H₂ confined in a bulb of 1 litre at 0°C is___.

• A. 25.215 atm
• B. 31.205 atm
• C. 45.215 atm
• D. 15.210 atm

Answer 1

The correct option is

C

25.215 atm

No. of moles of $O_2=\frac{4}{32}=0.125$

No.of moles of $H_2=\frac{2}{2}=1$

Total no. of moles = 1+0.125 = 1.125
T = 0+273 = 273K
R = 0.0821 $L.atm.K^{-1}mo{l}^{-1}$

$P=\frac{nRT}{V}=\frac{1.125\times 0.0821\times 273}{1}=25.215atm$