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

a. How long will it take for 30% of the C-14 atoms in a sample of C-14 to decay?

Express your answer using two significant figures.

b. If a sample of C-14 initially contains 1.9mmol of C-14, how many millimoles will be left after 2255 years?

Express your answer using two significant figures.

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