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A reaction is 50 % complete in 2 hours a...

A reaction is 50 % complete in 2 hours and 75 % complete in 4 hours . What is the order of the reaction?

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`(t)_(1/2)=2` hours `t_(3/4)=4`.hours `t_(3/4)=2(t)_(1 / 2)`. Hence `t_(1 / 2)` is independent of initial concentration. The reaction is first order.
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