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5.1 Monitoring chemical reactions

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Question 11

A technician checks the batch record for a process in which sodium hydrogencarbonate is heated.

2NaHCO3→Na2CO3+CO2+H2O \mathrm{2NaHCO_{3} \rightarrow Na_{2}CO_{3} + CO_{2} + H_{2}O} 2NaHCO3​→Na2​CO3​+CO2​+H2​O
MeasurementMass
Sodium hydrogencarbonate at the start16.8 g
Dry sodium carbonate recovered7.42 g

Relative atomic mass (ArA_rAr​): H = 1.0 C = 12.0 O = 16.0 Na = 23.0

What is the percentage yield of sodium carbonate?

[1]
A

142.9%

B

44.2%

C

63.1%

D

70.0%

Markscheme

5.1 Monitoring chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /5.1 Monitoring chemical reactions

152 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.

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