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Two chamber containing \( m_{1} \) and \( m_{2} \) grams of a gas at pressures \( P_{1} \) and \( P_{2} \) respectively are put
P in communication with each other, temperature remaining constant. The common pressure reached will be
(a) \( \frac{P_{1} P_{2}\left(m_{1}+m_{2}\right)}{P_{2} m_{1}+P_{1} m_{2}} \)
(b) \( \frac{P_{1} P_{2} m_{1}}{P_{2} m_{1}+P_{1} m_{2}} \)
(c) \( \frac{m_{1} m_{2}\left(P_{1}+P_{2}\right)}{P_{2} m_{1}+P_{1} m_{2}} \)
(d) \( \frac{m_{1} m_{2} P_{2}}{P_{2} m_{1}+P_{1} m_{2}} \)
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