Question

Question 7
Which of the following contains maximum number of molecules?

(a) $1gC{O}_2$
(b) $1g{N}_2$
(c) $1g{H}_2$
(d) $1gC{H}_4$

Answer 1

We know, 16 g of $C{H}_4$, 44g of $C{O}_2$ and 28g of $N_2$ consist of Avogardro number of particles.
But 2g of $H_2$ consist of Avogadro number of particles.
$\therefore 1gof{H}_2=\frac{1}{2}{N}_A=0.5N_A=0.5\times 6.022\times {10}^{23}=3.011\times {10}^{23}$