Answer:[tex]16.93\times 10^{23}\ \text{molecules}[/tex]
Explanation:
Given
Mass of [tex]CH_4[/tex] [tex]m=45\ gm[/tex]
Molar mass of [tex]CH_4[/tex] is [tex]12+4\times1=16[/tex]
No of moles of [tex]CH_4[/tex] [tex]=\dfrac{\text{Mass}}{\text{Molar mass}}=\frac{45}{16}[/tex]
No of Molecules in 45gm of [tex]CH_4[/tex] is
[tex]\Rightarrow N_A\times\frac{45}{16}=6.022\times 10^{23}\times \frac{45}{16}\\\Rightarrow 16.93\times10^{23}\ \text{molecules}[/tex]
