Calculations Involving Masses (Edexcel GCSE Chemistry: Combined Science)

Exam Questions

1 hour17 questions
1
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How many moles are present in 9 kg of glucose, C6H12O6?

Relative formula mass (Mr):       C6H12O6 = 180

  A 0.02 mol
  B 0.05 mol
  C 20 mol
  D 50 mol

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2
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What is the mass of 0.25 moles of hydrated copper(II) sulfate, CuSO4.5H2O?

Relative formula mass (Mr):  H2O = 18  CuSO4 = 160

  A 40.0 g
  B 44.5 g
  C 62.5 g
  D 1000 g

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3
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Nitrogen and hydrogen react together to make ammonia.

N2 + 3H2  2NH3

If 2.0 g of hydrogen is added to 12.0 g of nitrogen which substance is the limiting reactant and how much of the excess reactant remains?

Relative atomic masses (Ar): H = 1    N = 14

      Limiting Reactant Mass of excess reactant
  A nitrogen 2.0 g
  B nitrogen  10.0 g
  C hydrogen 2.7 g
  D hydrogen 9.3 g

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4
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A solution of CuSO4 has a concentration of 35 g dm-3.

What mass of CuSO4 would there be in 250 cm3 of the solution?

  A 140 g
  B 8.75 g
  C 7.14 g
  D 1.40 g

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5
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What is the relative formula mass of butene, C4H8 ?

(relative atomic masses: H=1, C=12)

  A 12
  B 13
  C 56
  D 100

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