For irreversible elementary reactions in parallel $A\overset{\quad K_{1}\quad}{ ightarrow}R ext{ a

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For irreversible elementary reactions in parallel $A\overset{\quad K_{1}\quad}{ightarrow}R	ext{ and }A\overset{\quad K_{2}\quad}{ightarrow}S$, the rate of disappearance of reactant ‘A’ is

Accepted Answer

$r_{A} = \left( - \frac{d\lbrack A\rbrack}{dt} \right)_{1} + \left( - \frac{d\lbrack A\rbrack}{dt} \right)_{2} = K_{1}\lbrack A\rbrack + K_{2}\lbrack A\rbrack = \left( K_{1} + K_{2} \right).\lbrack A\rbrack$

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