In three moles of ethane `(C_2H_6)` calculate : Number of molecules of ethane

Explanation

1 mole of `C_2H_6` will contains Avogadro's no., i.e., `6.02 xx 10^23` molecule
`therefore` 3 moles of `C_2H_6` will contain ethane molecules `3 xx 6.02 xx 10^23 = 18.06 xx 10^23` molecules