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At an elevated temperature the decomposition of a gaseous oxide,AO2 occurs with a rate constant,k = 0.54 M-1s-1.If the half-life of this reaction is 926 seconds when [AO2] = 2.0 × 10-3 M and 462 seconds when [AO2] = 4.0 × 10-3 M,this reaction is ________ order.
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