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1. If it takes 75 min for the concentration of a reactant to drop to 25% of its initial value in a first order reaction, what is the rate constant for the reaction in units min^-1?

2. If the initial concentration of the reactant in a first order reaction is .5 mols/L and the half life is 500 seconds, calculate the concentration of the reactant 1200 seconds after initiation of the reaction?

3. If Ea for the forward reaction is 321kj and the Ea for reverse reaction 390jk, what is the DeltaH for the reaction? Is it exothermic or endothermic?

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