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If half-life of a substance is 5 years, then the total amount of substance left after 15 years,

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asked Mar 30, 2018 in Chemistry by paayal (26,720 points) ● 4 ● 6 ● 11

If half-life of a substance is 5 years, then the total amount of substance left after 15 years, when initial amount is 64 grams is
(a) 16grams
(b) 2grams
(c) 32grams
(d) 8grams.

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answered Mar 30, 2018 by sanjaydas (61,430 points) ● 5 ● 7 ● 7
selected Apr 1, 2018 by Vikash Kumar
 
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