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2 g of NaOH (40 g/mol) is dissolved to make 500 mL of solution. What is its molarity?
A0.4 M
B0.2 M
C0.1 M
D0.05 M
Answer & Solution
Correct answer: C. 0.1 M
2 g is 0.05 mol, and 0.05 mol in 0.5 L gives 0.1 mol per litre.
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