80 g of oxygen contains as many atoms as in

Options

A. 10 g of hydrogen
B. 5 g of hydrogen
C. 80 g of hydrogen
D. 1 g of hydrogen

Answer

B

Explanation

No . Of mole of oxygen `=(80)/(16)=5`mol
1 mol contains avogadro no . Atom i.e., `6.02xx10^(23)` atoms.
`therefore` 5 mol contains `6.02xx10^(23)xx5` atom `=3.1xx10^(23)`
Similarly in option (b)
No . Of mol of hydrogen `=(5)/(1)=5` mol
5 mol of hydrogen contains `3.1xx10^(23)` atoms.