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Volume of a gas at STP is 1.12xx10 ^(...

Volume of a gas at STP is `1.12xx10 ^(-7) cc . ` Calculate the number of molecules in it :

A

`3.01xx10 ^(20)`

B

`3.01 xx 10 ^(15)`

C

`3.01xx 10 ^(23)`

D

`3.01 xx 10^(24)`

Text Solution

Verified by Experts

The correct Answer is:
B
`22.4 Its = 6.23 xx 10 ^(23) ` molecules
`1.12xx 10 ^(-7) cc = ( 6.023 xx 10 ^(23) xxoverset(0.05)(cancel (1.12))xx10 ^(-7))/(cancel (22.4))`
`=6.023xx0.05xx10 ^((23-7))`
`= 0.30115xx10 ^(16)`
`=3.0115 xx 10 ^(15)`
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