ChemistryWaterJAMB
Find the percentage of water by mass in Na₂CO₃·10H₂O. [Na = 23, C = 12, O = 16, H = 1]
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Answer: C. 62.9%
M = 106 + 180 = 286; 180/286 × 100 ≈ 62.9%.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.