1.

How many molecules at present in one gram of hydrogen?

Answer»

`6.023xx10^(23)`
`3.011xx10^(23)`
`2.5xx10^(23)`
`1.5xx10^(23)`

Solution :Hint : `H_(2)="Molar MASS"=2g`
`"2 G of "H_(2)" contains "6.023xx10^(23)`
molecules
`THEREFORE" 1 g of "H_(2)" will contain"`
`(6.023xx10^(23))/(2)xx1`
`=3.011xx10^(23)" molecules."`


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