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2 litres of a 9.8% w/w H2SO4 solution (density = 1.5 g/mL) is mixed with 3 litres of 1 M KOH solution. How many moles of H2SO4 were added?

1. 1
2. 2
3. 3
4. 0.5

Correct answer: 3

Solution

Mass of solution = 2000 mL * 1.5 = 3000 g; H2SO4 mass = 9.8% * 3000 = 294 g; moles = 294/98 = 3.

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