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2.6 Calculations involving masses

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Question 17
H

How many particles are present in 0.25 mol of a substance? Use the Avogadro constant 6.02 × 1023 mol-1.

[1]
A

6.02×10236.02 \times 10^{23}6.02×1023

B

2.41×10232.41 \times 10^{23}2.41×1023

C

1.51×10231.51 \times 10^{23}1.51×1023

D

2.41×10242.41 \times 10^{24}2.41×1024

Markscheme

2.6 Calculations involving masses Questions

  1. GCSE
  2. /Chemistry
  3. /2.6 Calculations involving masses

55 exam-style questions on Edexcel GCSE Chemistry 2.6 Calculations involving masses, covering 2.6.1 Relative formula mass and percentage composition, 2.6.2 Empirical and molecular formulae, 2.6.3 Conservation of mass, 2.6.4 Reacting masses and concentration in g dm⁻³, 2.6.5 The mole and the Avogadro constant, and 2.6.6 Limiting reactants and stoichiometry. Each one has a worked solution and a mark scheme showing where the marks go.

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