Question

If 3.65 got HCl is dissolved in 16.2 g of water then the mole fraction of HCl in the resulting solution is:

Answer 1

Mole fraction is defined as the ratio of moles of a particular substance to the total moles of the mixture.

To calculate the moles, we use the equation:

$\text{Nummber of moles}=\frac{\text{given mass}}{\text{molar mass}}$

$\text{Numbar of moles of HCl}=\frac{3.65}{36.5}=0.1mol$

$\text{Number of moles of water}=\frac{16.2gm}{18gm/mol}=0.9mol$

$\text{Mole fraction of HCl}=\frac{\text{mole of HCl}}{\text{mole of water}+\text{mole of HCl}}$

$\text{Mole fraction of HCl}=\frac{0.1}{0.9+0.1}=\mathrm{0.1.}$

So the answer is $\mathrm{0.10.}$