The number of atoms present in 1 g of hydrogen gas is the same as are present in

Options

A. 4 g of Helium
B. 32 g of Oxygen
C. 7 g of Nitrogen
D. 24 g of Carbon

Answer

A

Explanation

`2 g " of Hydrogen "= 6xx10^(23)" molecules of "H_2`
`-=2xx6xx10^(23)" atoms of "H_2`
`1 g " of Hydrogen "-= 6xx10^(23)" atoms of Hydrogen "`
(a) 4 g He `-= 6xx10^(23)" atoms of He"`
(b) `32 g" of "O_2 -=2xx6xx10^(23)" atoms of oxygen"`
`= 12xx10^(23)" atoms of oxygen"`
( c) `7 g " of " N_2 -= (2xx6xx10^(23)xx7)/(28)" atoms of " N_2`
`=3xx10^(23)" atoms of " N_2`
(d) `24 g " of " C -=(6xx10^(23)xx24)/(12)`
`= 12xx10^(23)" atoms of carbon"`
Correct answer is (a).