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Question

The volume of a gas at STP is 1.12×107 cc. The number of molecules in it will be:

A
3.1×1020
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B
3.01×1012
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C
30.1×1013
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D
3.01×1024
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Solution

The correct option is B 3.01×1012
Volume of 1 mole of gas at STP is 22.4 L or 22400 mL or 22400 cc
22400 mL of gas contains 6.023×1023 molecules
1.12×107 cc contain 6.023×102322400×1.12×107 molecules
=3.01×1012 molecules

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