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Determine the molarity of a solution with 70% acid concentration and a molecular weight of 70 g/mol, using the formula M = mass × 1000 / molar mass × volume (mL).

1. Mass = 63 g
2. Mass = 100 g
3. Mass = 31.5 g
4. Mass = 45 g

Correct answer: Mass = 63 g

Solution

The weight of the acid in 100 g of solution is 70% of 100 g, i.e., 70 g. Substituting into the formula, M = (70 × 1000) / (70 × 1000) = 1 M. Thus, wt = 63 g is correct.

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