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A sulphuric acid solution is 13% H2SO4 by mass and has density 0.98 g/mL. Calculate its molarity. (Molar mass of H2SO4 = 98 g/mol)

1. 1.30 M
2. 0.13 M
3. 2.60 M
4. 1.00 M

Correct answer: 1.30 M

Solution

Using M = (10 * mass% * d)/M_molar = (10 * 13 * 0.98)/98 = 1.30 mol/L.

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