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The compound X reacts via a first order reaction with a rate constant of 1.50 hr -1 . If 10.0 moles of X are currently

The compound "X" reacts via a first order reaction with a rate constant of 1.50 hr^-1. If 10.0 moles of "X" are currently present, how many moles of "X" were present 30.0 min ago?

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