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. 1g of hydrogen

Answer

B

Explanation

80 g of `O_(2)=(80)/(32)` mol = 2.5 mol
`=2.5xx2xx6.02xx10^(23)` atoms of O
5g of `H_(2) = 5//2` mol = 2.5 mol
`=2.5xx2xx6.02xx10^(23)` atoms of H