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2.6 Calculations involving masses

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Question 9
H

Figure: Containers with 8.0 g He\mathrm{He}He, 32 g O2\mathrm{O_{2}}O2​ and 33 g CO2\mathrm{CO_{2}}CO2​ image

The 32 g sample of O2\mathrm{O_{2}}O2​ contains 1.00 mol of O2\mathrm{O_{2}}O2​ molecules. How many oxygen atoms does it contain? Use the Avogadro constant 6.02 × 1023 mol-1.

[1]
A

3.01×10233.01 \times 10^{23}3.01×1023

B

6.02×10236.02 \times 10^{23}6.02×1023

C

1.93×10251.93 \times 10^{25}1.93×1025

D

1.20×10241.20 \times 10^{24}1.20×1024

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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