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Commercial concentrated sulphuric acid is 95% H2SO4 by mass and has a density of 1.834 g/cm³. Calculate the molarity of this acid. (Molar mass of H2SO4 = 98 g/mol)

1. 17.8 M
2. 15.7 M
3. 10.5 M
4. 12.0 M

Correct answer: 17.8 M

Solution

Using molarity = 10*d*w%/M = 10*1.834*95/98 = 17.8 M.

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