Question

If 1000 $ml$ of gas $A$ at 600 $torr$ and 500 $ml$ of gas $B$ at 800 $torr$ are mixed in a 2 litre flask, the pressure of the mixture at constant temperature will be:

• A. 500 $torr$
• B. 1000 $torr$
• C. 850 $torr$
• D. 2000 $torr$

Answer 1

The correct option is A 500 $torr$

$P=\frac{P_1{V}_1+P_2{V}_2}{V}$

$P=\frac{1000\times 600+500\times 800}{2000}=500$ $torr$

Hence, the correct answer is option $\text{A}$.