Question

Find the molality of H₂SO₄ solution whose specific gravity is 1.98 g ml^-1 and 95% by volume H₂SO₄

(A) 7.412 

(B) 8.412 

(C) 9.412 

(D) 10.412

Answer 1

Correct Option (C) 9.412 

Explanation:

H₂SO₄ is 95% by volume

wt. of H₂SO₄ = 95g

Vol of solution = 100ml

:.  Moles of H₂SO₄ =95/98, 

and weight of solution = 100 x 1.98 g

Weight of water = 198 - 95 = 103 g

Molality = 95 x 1000/98 x 103 = 9.412

Hence molality of H₂SO₄ solution is 9.412