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

Moles of oxygen `=80/16 = 5` mol
No. of atoms of oxygen `=5 xx 6.022 xx 10^(23)`
Moles of hydrogen in 5g `=5/1 = 5` mol
No. of atoms of hydrogen `=5 xx 6.022 xx 10^(23)`