Question

Calculate, how many methane molecules and how many hydrogen and carbon atoms are there in 25.0 g of methane?

Answer 1

Mass of methane molecule $12+4=16g$

$16g$ of $C{H}_4$ $=N$ molecules or $N$ atom of $C$

$25gC{H}_4=\frac{6.023\times {10}^{23}\times 25}{16}$ atoms of $C$

$=9.41\times {10}^{23}$atoms of $C$ and $4\times 9.41\times {10}^{23}$atoms of $H=$$3.764\times {10}^{24}$