5 g of NaOH (molar mass 40 g/mol) is dissolved in 450 mL solution. The…

Question

5 g of NaOH (molar mass 40 g/mol) is dissolved in 450 mL solution. The molarity is closest to

Accepted Answer

B. {'text': '0.278 M', 'label': 'B'}

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: NCERT Class 12 Chemistry, Unit 1 "Solutions", Example 1.2_

Answer

{'text': '0.125 M', 'label': 'A'}

Answer

{'text': '0.400 M', 'label': 'C'}

Answer

{'text': '0.500 M', 'label': 'D'}