What percentage of 145X (t1/2 = 768.7 h) would remain after 505.4 hours. Use the formula with 0.693 instead of ln 2. The data for element X does not exist. All numbers are hypothetical

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Chapter1: Chemical Foundations
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What percentage of 145X (t1/2 = 768.7 h) would remain after 505.4 hours. Use the formula with 0.693 instead of ln 2.

The data for element X does not exist. All numbers are hypothetical

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Use first order kinetics formula to get the answer 

Remaining percent=64.93%

 

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