Question

What is the mass ratio of ethylene glycol $(C _2H _6O_2$, molar mass $62\ g/mol)$ required for making $500\ g$ of $0.25$ molal aqueous solution and $250\ ml$ of $0.25$ molal aqueous solution?

• A. $1: 2$
• B. $1: 1$
• C. $3:1$
• D. $2:1$

Answer 1

Answer: (D)

$2:1$

Answer 2

Assume : Mass of solvent ≈ Mass of solution
Case I :-
0.25=62W1​​×5001000​
Case II :-
0.25=62W2​​×2501000​
W2​W1​​=12​

So, the correct option is (D): $2:1$