First slide

Kinetics of chemical reactions

Question

For a reaction $2 A \to A_{2}$ , the rate of reaction becomes 8 times when the concentration of A changes from a to 2a . The order of reaction is _____

Moderate

Solution

$2 A \to A_{2}$
$r = K {[A]}^{m}$
$r_{1} = K {[a]}^{m}$
$8 r_{1} = K {[2 a]}^{m}$
$m = 3$

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