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[" 45.In a first order reaction,"75%" of...

[" 45.In a first order reaction,"75%" of the reactants disappeared "],[" in "1.386" hours.What is the rate constant? "],[[" (a) "3.6times10^(-3)sec^(-1)," (b) "2.7times10^(-4)sec^(-1)],[" (c) "72times10^(-3)sec^(-1)," (d) "1.8times10^(-3)sec^(-1)]]

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