A pure first-order gas-phase decomposition takes place at constant volume. If is the initial pressure and is the total system pressure at time , which is the correct integrated rate law?

Question

A pure first-order gas-phase decomposition $A(g) \rightarrow B(g) + C(g)$ takes place at constant volume. If $P_0$ is the initial pressure and $P_t$ is the total system pressure at time $t$, which is the correct integrated rate law?

Prashant Kotian · Accepted Answer

Correct answer: B. At time , pressure of A is , B is , C is . Total pressure , so . Remaining pressure of A is . Substituting this into the master first-order equation gives .

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