Q. 74.3( 15 Votes )

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. 1 m

Answer :

The molar mass of HCl is 1x1 + 35.5x1 = 36.5. The given solution contains 18.25g of HCl gas. The number of moles is 18.25/36.5 = 0.5 mol. The molality is calculated by the formula


Molality = 0.5/0.5 = 1m.


The molality of the solution is 1 m. The correct answer is (iv).

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