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Question

What will be the molality of the solution containing 18.25 g of HCl gas in 500 g of water?

A
0.1 m
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B
1 m
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C
0.5 m
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D
2 m
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Solution

The correct option is B 1 m

Molality can be defined as the "number of moles" of solute per kilogram quantity of a solvent. In other words, it is the concentration of the solute in a solution.

We also know that, the molecular weight of HCl is (1 + 35.5) = 36.5

So, the "number of moles" of solute =18.2536.5=0.5 mol

Molality=Number of moles of soluteMass of the solvent×1000

Molality=0.5500×1000=1m.

The molality of the solution is 1 m.

The correct option is B.


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