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2.6 Calculations involving masses

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Question 2

A chemical works processes sodium hydrogen carbonate into sodium carbonate by heating it.

2NaHCO3→Na2CO3+CO2+H2O \mathrm{2NaHCO_{3} \rightarrow Na_{2}CO_{3} + CO_{2} + H_{2}O} 2NaHCO3​→Na2​CO3​+CO2​+H2​O

The feedstock contains 80.0% sodium hydrogen carbonate by mass. The works assumes that the reaction goes to completion and that there are no processing losses. It needs to produce 4.24 tonnes of sodium carbonate.

ElementNaHCO
Relative atomic mass2311216

What is the minimum mass of feedstock needed?

[1]
A

4.20 tonnes

B

5.30 tonnes

C

6.72 tonnes

D

8.40 tonnes

Markscheme

2.6 Calculations involving masses Questions

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

142 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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