Question

How many molecule present in $3.46g$ of Hydrochloric acid?

Answer 1

1 mole of Hydrochloric acid (36.5g) of hydrochloric acid cntains $6.625\times {10}^{23}$ molecules of $HCl$

Then 3.46g of $HCl$ contains $\frac{3.46\times 6.625\times {10}^{23}}{36.5}=0.628\times {10}^{23}$ molecules of $Hcl$.