A student has a first order reaction with k=0.050 s−1k = 0.050\ \text{s}^{-1}k=0.050 s−1. She writes t1/2=k/0.693=0.072 st_{1/2} = k/0.693 = 0.072\ \text{s}t1/2=k/0.693=0.072 s. What is her mistake?
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