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A 0.010 M solution has a volume of 1 L and contains 1.8 g of solute. What is the molar mass of the solute?

Answer and explanation

Correct answer: 180 g mol⁻¹

Molarity gives moles per litre of solution. Therefore, the moles of solute are n = M × V = 0.010 mol L⁻¹ × 1 L = 0.010 mol. The molar mass is then mass ÷ moles = 1.8 g ÷ 0.010 mol = 180 g mol⁻¹. Thus, option C is correct. The volume must be expressed in litres because the concentration is given in mol L⁻¹.

Related tags

Molar MassMolarityStoichiometrySolutions NumericalMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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