Question

What will be the pressure of the gaseous mixture when 0.5 L of $H_2$ at 0.8 bar and 2.0 L of dioxygen at 0.7 bar are introduced in a 1 L vessel at ${27}^{\circ }C$?

• A. 2 bar
• B. 0.8 bar
• C. 1.8 bar
• D. 2.8

Answer 1

The correct option is C

1.8 bar

$For{H}_2,P_1{V}_1=P_2{V}_2\Rightarrow 0.8\times 0.5=P_{H_2}\times 1\Rightarrow P_{H_2}=0.4bar$
$For{O}_2,P_1{V}_1=P_2{V}_2\Rightarrow 0.7\times 2=P_{O_2}\times 1\Rightarrow P_{O_2}=1.4bar$
Therefore, $P_{total}=P_{H_2}+P_{O_2}$ = 0.4 + 1.4 = 1.8