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Cambridge IGCSE Chemistry practice

Paper 4 structured question: The mole and the Avogadro constant

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The mole and the Avogadro constant

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Paper 4Theory (Extended)3 marks

Calculating concentrations and volumes in a chemical reaction.

Description

Concentration Calculation

A solution contains 20 g of sodium chloride (NaCl) dissolved in 1 dm³ of water. Calculate the concentration of the solution in g/dm³ and mol/dm³.

  1. a

    Calculate the concentration in g/dm³.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Calculate the concentration in mol/dm³ (molar mass of NaCl = 58.5 g/mol).

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 4 structured question: The mole and the Avogadro constant

Paper 4Theory (Extended)1 marks

Description

Reaction of A and B

In a reaction, 2 moles of A react with 3 moles of B to produce 4 moles of C. If you start with 5 moles of A and 7 moles of B, determine the limiting reactant and the amount of product formed.

  1. a

    State the limiting reactant in this reaction.

    Aim for approximately 1 distinct marking point.

    [1]