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10^21 molecules are removed from 200 mg ...

`10^21` molecules are removed from 200 mg of `CO_2`. The moles of `CO_2` left are

A

`2.88 xx 10`

B

`28.8 xx 10^(-3)`

C

`288 xx 10^(-3)`

D

`28.8 xx 10^3`

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The correct Answer is:
A
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