What is a half life?

The time taken for half of a given amount of radioactive substance to decay.

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Answered by Emma S. BMAT (BioMedical Admissions) tutor

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On complete combustion in air, a sample of an unknown hydrocarbon yielded 176 grams of CO2 and 108 grams of H2O with no additional products. Which one of the following might be the formula of the hydrocarbon? (Relative atomic masses: H=1, C =12, O =16)


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