Question

3 g of a salt of molecular weight 30 is dissolved in 250 g of water. The molality of the solution is ............... .

Answer 1

Molality = moles of solute / mass of solvent

First find moles of salt

n = m / M = 3 / 30 = 0.1moles

Mass of solvent = 250g = 0.25kg

Now put in formula

= 0.1 / 0.25

= 0.4 moles/kg

Thanks

Answer 2

Answer:

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