allery5 g of NaOH (molar mass 40 g/mol) is dissolved in 450 mL solution. The molarity is closest to
A0.125 M
B0.278 M
C0.400 M
D0.500 M
Answer & Solution
Correct answer: B. 0.278 M
1. Moles of NaOH = 5 / 40 = 0.125 mol.
2. Volume of solution = 450 / 1000 = 0.450 L.
3. Molarity = moles / volume = 0.125 / 0.450 = 0.278 mol/L.
4. So the solution is 0.278 M.
_Source: syllabus Chemistry, Unit 1 "Solutions", Example 1.2_
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