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
B
1 m
C
0.5 m
D
2 m

Solution

## The correct option is B 1 mMolality 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 $$= \dfrac{18.25}{36.5} = 0.5\ mol$$ $$Molality = \dfrac {Number \ of \ moles \ of \ solute} {Mass \ of \ the\ solvent} \times 1000$$ $$Molality = \dfrac{ 0.5}{500} \times 1000 = 1 m.$$ The molality of the solution is 1 m. The correct option is B. Chemistry

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