Equilibrium \(\equiv\) Rate Of Forward \(=\) Backward Reaction

Chemistry Level 3

\[\large \ce{NH4COONH2_{~~(s)} \rightleftharpoons 2NH3_{~~(g)} + CO2_{~~(g)}}\]

For the above reaction, \(\ce{NH4COONH2}\) is placed in a closed vessel and equilibrium is attained. Let the total pressure of the system be \(P_1\).

After the reaction attains equilibrium, some \(\ce{NH3}\) is added to the system in such a way that after equilibrium is attained, \(P_{\ce{NH3}}\) equals \(P_1\). Let the total pressure of the system after equilibrium is attained again be \(P_2\).

What is the ratio \(\dfrac{P_2}{P_1}\) ?


  • \(P_\text{gas}\) represents the partial pressure of the gas.

  • The temperature of the gas remains constant.


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