Question

At a constant temperature, 250ml of argon at 760mm pressure and 600ml of nitrogen at 500mm pressure are put together in a one litre flask. Calculate the final pressure.

Answer 1

number of moles is conserved

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

$\Rightarrow 0.25\times 760+0.6\times 500=P\times T$

$\Rightarrow 190+300=P$

$\Rightarrow P=490mm$