ChemistryChemical combinationWAEC
How many moles are in 9 g of water? (H = 1, O = 16)
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Answer: A. 0.5
Molar mass of H₂O = 18 g/mol; 9 ÷ 18 = 0.5 mol.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.