Question

In a thermally isolated system. Two boxes filled with an ideal gas are connected by a valve. When the valve is in closed position, states of the box 1 and 2, respectively,are (1 atm, $V_{i}T$) and (0.5 atm, 4V, T). When the valve is opened, the final pressure of the system is approximately.

• A. 0.5 atm
• B. 0.6 atm
• C. 0.75 atm
• D. 1.0 atm

Answer 1

The correct option is B 0.6 atm

$v_i=v_l$
$\frac{5}{2}\times 1\times V+\frac{5}{2}\times 0.5\times 4v=\frac{5}{2}P5V$
$P=\frac{3}{5}=0.6$