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1.5.2
(CST): Computer-Scored Unit Test
Question 2 of 25
What is the molality of a solution made by dissolving 6 moles of NaOH in 3 kg
of water?
A. 0.5 mol/kg
B. 3 mol/kg
C. 0.33 mol/kg
D. 2 mol/kg

Sagot :

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The molality of a solution : m = 2 mol/kg

Further explanation

Given

6 moles of NaOH

3 kg water

Required

The molality

Solution

Molality shows the number of moles dissolved in every 1000 grams of solvent( 1 kg solvent)

m = n. (1000 / p)

m = Molality

n = number of moles of solute

p = Solvent mass (gram)

Input the value :

m = 6 moles : 3 kg

m = 2 mol/kg

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