We have to calculate the mole fraction of HCl in a 32% by mass solution of HCl.

**Mass percent** of a component in solution is calculated by this formula:

$\overline{){\mathbf{mass}}{\mathbf{}}{\mathbf{percent}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{component}}{\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{solution}}{\mathbf{\times}}{\mathbf{100}}{\mathbf{}}{\mathbf{\%}}}$

An aqueous solution contains 32% HCl by mass.

Calculate mole fraction of the solution.

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