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Question

If 1021 molecules are removed from 200mg of CO2, then the number of moles of CO2 left are:

A
2.89×103
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B
28.8×103
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C
0.289×103
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D
1.68×102
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Solution

The correct option is A 2.89×103
Number of c2 molecules in 200mg=200×10344×6.022×1023=2.7373×1021. Now, 1021 molecules are removed. so, left number =(2.73731)×1021=1.7373×1021

Hence, no. of moles left =1.7373×10216.022×1023=2.89×103moles so option (A) is correct.

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