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A first order decomposition reaction has a half-life of 61.9yr. What percentage of the original amount is left after 163.5 years? Note: answer must be

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A first order decomposition reaction has a half-life of 61.9yr. What percentage of the original amount is left after 163.5 years? Note: answer must be entered in e-notation, for example 1.23E0 (not 1.23) and 1.23E- Ahot 0.123 ). (value2%)

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