1.

80 g of oxygen contains as many atoms as in

Answer»

10 g of hydrogen
5 g of hydrogen
80 g of hydrogen
1 g of hydrogen

Solution :No . Ofmole 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.


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