Which has more atoms?
(a)10g of nitrogen `(N_(2))`?
10g of ammonia `(NH_(3))`

Explanation

Gram molar mas of `N_(2)=2xx14=28g`
`28"g of "N_(2)"have nitrogen atoms"=2xxN_(A)`
`10"g of "N_(2)"have nitrogen atoms"=2xxN_(A)xx((10g))/((28g))=0.7143xxN_(A)=0.7143xx6.022xx10^(23)`
`=4.3xx10^(23)"atoms"`
(b) `"Molar mass of "NH_(3)=14xx3xx1=17g`
`17"g of "NH_(3)"have atoms"=4xxN_(A)`
`10"g of "NH_(3)"have atoms"=4xxN_(A)xx(10g)/(17g)=2.353xxN_(A)`
`=2.353xx6.022xx10^(23)=14.16xx10^(23)"atoms"`
This shows that 10g of `NH_(3)` have more number of atoms that 10g of `N_(2)`.