WAEC Chemistry 2025 Theory — Question 42
Question 42 of 70 from the West African Examinations Council (WAEC) Chemistry 2025 Theory paper, with the correct answer and a full explanation.
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4(b)(ii). Calculate the mass concentration of 0.10 mol dm-3 Na2CO3. [Na2CO3 = 106]
Model answer
Mass concentration = molar concentration x molar mass = 0.10 x 106 = 10.6 g dm-3.
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