The half life of .^(218)Pa is 3 minutes....

The half life of `.^(218)Pa` is 3 minutes. What mass of a 16 g sample of `.^(218)Pa` will remain after 15 minutes ?

A

3.2 g

B

2.0 g

C

1.6 g

D

0.5 g

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The correct Answer is:

D

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