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Question

For the reaction,
A+BC
The concentration of A initially was observed to be 0.2 mol/L and the concentration of A after 20 min was found out to be 0.16 mol/L.

Calculate the average rate of reaction (rav) for first 20 min in mol L1min1

A
1×103
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B
5×104
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C
1×104
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D
2×103
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Solution

The correct option is D 2×103
Average rate of reaction:
rav=[A]final[A]initialtfinaltinitial=ΔAΔt
Here [A]final,[A]initial are the concentration of reactant A at tfinal,tinitial respectively
rav=0.160.220 mol L1min1
rav=2×103 mol L1min1

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