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Which of the following solutions contains 40 g of NaOH? (Molar mass NaOH = 40 g/mol)

1. 50 g of 80% (w/w) NaOH
2. 50 g of 80% (w/v) NaOH [d = 1.2 g/mL]
3. 50 mL of 20 M NaOH [d = 1 g/mL]
4. 50 g of 5 m NaOH

Correct answer: 50 g of 80% (w/w) NaOH

Solution

80% (w/w) of 50 g is exactly 40 g of NaOH; the other options do not give 40 g.

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