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Study of a first-order reaction

In the study of a first-order reaction, A--->B, it is found that A/Ao=0.125 after one hour. The system initially consisted of 0.20 mole of a gaseous A at 25 degrees C and 1 atm. Calculate the initial rate of reaction in moles of A reacting per minute.

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Rate of first order reaction=kA

We can also write dA/dt=kA
Re-arrange: ...

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