The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of...

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The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of...

The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of initial concentration.

a) How long will it take for 17 % of the U−238 atoms in a sample of U−238 to decay?

Express your answer using two significant figures and in yrs

b) If a sample of U−238 initially contained 1.8×10¹⁸ atoms and was formed 4.9 billion years ago, how many U−238 atoms does it contain today?

Express your answer using two significant figures.

science chemistry

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Answer 1

Answer #1

(so today number of atoms=.86×1018

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Answer 2

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