(Answered) The half-life for the radioactive decay of c-14 is 5730

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The half-life for the radioactive decay of C-14 is 5730 years.

A) How long will it take for 20% of the C-14 atoms in a sample of C-14 to decay?

B) If a sample of C-14 initially contains 1.9 mmol of C-14, how many millimoles will be left after 2270 years?

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