Question

Q 12/30 A sample of H2SO4 is 80% by mass and shows density of 1.78 g/ml. What is the
molarity of acid?
17.8 M
1.45 M
15.6 M
14.5 M

Answer 1

Given,

A sample of H₂SO₄ is 80% by mass and density of solution is 1.78 g/ml.

To find,

molarity of acid in the solution.

The sample of H₂SO₄ is 80% by mass. means 80g of H₂SO₄ in 100g of solution.

now volume of solution, V = mass/density

= 100/1.78 ml

= 56.18 ml

number of moles of H₂SO₄ = 80/98 = 0.816

now molarity = number of moles of H₂SO₄/volume of solution in L

= 0.816/56.18/1000

= 816/56.18

= 14.52 ≈ 14.5M

Therefore option (D) 14.5 M, is correct choice.

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