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Question

Commercially available HCl contains 38% HCl by mass. Calculate molality of the solution.

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Solution

38%HCl by mass means 38g of HCl in 100g of solution.
As we know that,
molality =No. of moles of soluteWt. of solvent(in Kg)
Therefore,
Weight of solvent =10038=62g
Molecular weight of HCl=36.5g
No. of moles of HCl=3836.5=1.041 mol
molality =1.04162×1000=16.79
Hence the molality of solution is 16.79.

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