Which of the following correctly converts a concentration of 4.0 g/dm³ of sodium hydroxide (NaOH) to mol/dm³?
[Relative atomic masses: H = 1, O = 16, Na = 23]

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Question

Which of the following correctly converts a concentration of 4.0 g/dm³ of sodium hydroxide (NaOH) to mol/dm³?
[Relative atomic masses: H = 1, O = 16, Na = 23]

Accepted Answer

0.10 mol/dm³ — 10 mol/dm³). Award 1 mark for correct conversion. Mr of NaOH = 23 + 16 + 1 = 40. Concentration in mol/dm³ = 4.0 ÷ 40 = 0.10 mol/dm³. B is incorrect — this divides by 24 (molar volume) instead of Mr. C is incorrect — this is the Mr value, not the concentration. D is incorrect — this multiplies instead of dividing.

Answer

40 mol/dm³

Answer

0.10 mol/dm³

Answer

0.17 mol/dm³

Answer

160 mol/dm³

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