Question

What will be molality of 10 % w/w NaOH(aq) solution?

(A) 2.87 (B) 2.5 (C) 2.78 (D) 2.46​

Answer 1

Answer:

I think answer is 2.5 if right reply me please

Answer 2

Answer:

(C) 2.78

Explanation:

10% w/w means 10 g of NaOH is dissolved in 100 g of solution.

Moles of NaOH = 10/40 = 0.25 mol

Mass of solvent = 100 - 10 = 90 g

Molality = moles × 1000/mass of solvent

= 0.25 × 1000/ 90

= 250/90

= 2.78 m