Question

How many atoms of hydrogen are there in 36 g of $NH{4}^{+}$?

Answer 1

Molar mass of $N{H}_4^{+}$ $=14+4=18gmol{e}^{-1}$

No. of moles of $N{H}_4^{+}$= $\frac{givenmass}{molarmass}=$ $\frac{36}{18}=2moles$

Now total moles of hydrogen atoms $=4\times 2moles=$ $8\times 6.022\times {10}^{23}=48.176\times {10}^{23}or4.82\times {10}^{24}.$