Problem- fluorine-18 decays via first-order kinetics and, Chemistry

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Problem- fluorine-18 decays via first-order kinetics and

Problem- Fluorine-18 decays via first-order kinetics and has a half-life of 109.77 minutes. Starting from a 1 gram sample,

a) How much F-18 remains after 5 half-life?

b) What percentage of F-18 remains after 24 hours?

For 1 half life, I got k= 0.0063132.

A) I multiplied 209.77 min by 5 then, 548.85 = .693/k = 0.00126264.

What did I do wrong?

B) I'm not sure how to start it....

I have read my textbook moreover I still don't understand so please provide me a very condensed, simple to know answer?

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