Unit 1: Structure 1: Models of the Particulate Nature of Matter
Topic 1.4: Counting Particles by Mass: The Mole Questions
Practice 6 exam-style questions for IB Chemistry Topic 1.4. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1Calculate2 marks
• Aimnova practice
A 5.85 g sample of sodium chloride, NaCl, is weighed out.
Calculate the amount, in moles, present.
(M(NaCl) = 58.44 g mol⁻¹.)
Calculate the amount, in moles, present.
(M(NaCl) = 58.44 g mol⁻¹.)
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• Aimnova practice
A hydrocarbon has the empirical formula CH and a relative molecular mass of 78.
Determine its molecular formula.
(Empirical formula mass of CH = 13.02.) [2]
Determine its molecular formula.
(Empirical formula mass of CH = 13.02.) [2]
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• Aimnova practice
Calculate the number of hydrogen atoms in 0.200 mol of ammonia, NH3.
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• Aimnova practice
A compound contains 52.2% carbon, 13.0% hydrogen and 34.8% oxygen by mass.
Determine its empirical formula.
(Ar: C = 12.01, H = 1.01, O = 16.00.) [3]
Determine its empirical formula.
(Ar: C = 12.01, H = 1.01, O = 16.00.) [3]
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Calculate the mass of glucose, C6H12O6, needed to prepare 250.0 cm³ of a 0.100 mol dm⁻³ solution.
(M = 180.18 g mol⁻¹.) [2]
(M = 180.18 g mol⁻¹.) [2]
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• Aimnova practice
A 25.0 cm³ sample of 0.480 mol dm⁻³ copper(II) sulfate solution is diluted with water to a total volume of 200.0 cm³.
Calculate the concentration of the diluted solution. [2]
Calculate the concentration of the diluted solution. [2]
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