Q.
Complete combustion of $3\, g$ of ethane gives $x \times 10^{22}$ molecules of water. The value of $x$ is (Round off to the Nearest Integer).
[Use : $N _{ A }=6.023 \times 10^{23}$; Atomic masses in $u : C : 12.0 ;\, O : 16.0 ;\, H : 1.0$]
Solution: