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If carbon-14 has a half-life or 5,730 years, how much of a 50g sample of carbon-14 would be left after 2 half-lives?

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bc160402048

After 1st half life the remaining carbon is 25 g as 50/2= 25g showing that 25g decay and 25g will left.

After second half life it is 25/2=12.5 shows that

After two half lives there will be 12.5g of C-14 is left from 50g of sample

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