Question

Which of the following solutes will produce the largest total molality of solute particles upon addition of 1 kg of water?

• A. 1.0 mole $Co(N{O}_3{)}_2$
• B. 2.0 mole KCl
• C. 3.0 mole $C_2{H}_{5}OH$
• D. 3.0 mole of sugar

Answer 1

The correct option is B

2.0 mole KCl

Largest molality of solute particles refers to the most number of ions produces per mole of the electrolyte multiplied by the number of moles. This would be the product of 'i' and the number of moles.

Where i = van’t Hoff factor

In case of 2 mole KCl

It is 2 $\times$ 2 = 4

In case of $Co(N{O}_3{)}_2=3\times 1=3$

$C_2{H}_{5}OH=3\times 1=3$

Sugar = 3 $\times$ 1 = 3