1.

Which one of the following has maximum number of atoms?

Answer»

`"18 g of "H_(2)O`
`"18G of "O_(2)`
`"18 g of "CO_(2)`
`"18 g of "CH_(4)`

Solution :Hint : `"Number of atoms"=("Mass of substance")/("Molar mass")xxN_(A)xx"Number of atoms in the MOLECULE"`
`"18 g of "H_(2)O=(18)/(18)xxN_(A)xx3=3N_(A)`
where `N_(A)=6.023xx10^(23)`
(b) `"18 g of "O_(2)=(18)/(32)xxN_(A)xx2=1.12N_(A)`
(C ) `"18 g of "CO_(2)=(18)/(44)xxN_(A)xx3=1.23N_(A)`
(d) `"18 g of "CH_(4)=(18)/(16)xxN_(A)xx6=5.60N_(A)`
`therefore` (d) is the correct answer.


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