For irreversible elementary reactions in parallel: A -(K1)- R and A -(K2)- S, the rate of disappearance of reactant 'A' is

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For irreversible elementary reactions in parallel: A -(K1)-> R and A -(K2)-> S, the rate of disappearance of reactant 'A' is

Prashant Kotian · Accepted Answer

Correct answer: B. Since reactant A decomposes parallelly into R and S, the total rate of disappearance is the sum of rates of both reactions: -dC_A/dt = (-dC_A/dt)_1 + (-dC_A/dt)_2 = k1 C_A + k2 C_A = (k1 + k2) C_A.

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