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Chemical formulae, equations and calculations

Chemical formulae, equations and calculations

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Question 61

When baking soda, sodium hydrogencarbonate (NaHCO3\text{NaHCO}_3NaHCO3​), is heated during baking, it decomposes to form sodium carbonate (Na2CO3\text{Na}_2\text{CO}_3Na2​CO3​), water vapour, and carbon dioxide gas according to the equation:

2NaHCO3(s)→Na2CO3(s)+H2O(g)+CO2(g) 2\text{NaHCO}_3\text{(s)} \rightarrow \text{Na}_2\text{CO}_3\text{(s)} + \text{H}_2\text{O(g)} + \text{CO}_2\text{(g)} 2NaHCO3​(s)→Na2​CO3​(s)+H2​O(g)+CO2​(g)

A 12.60 g12.60\text{ g}12.60 g sample of sodium hydrogencarbonate (Mr=84.0M_r = 84.0Mr​=84.0) is completely decomposed by heating.

Calculate the mass, in grams, of sodium carbonate (Mr=106.0M_r = 106.0Mr​=106.0) formed.

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Chemical formulae, equations and calculations Questions

  1. IGCSE
  2. /Chemistry
  3. /Chemical formulae, equations and calculations

80 exam-style questions on Edexcel IGCSE Chemistry Chemical formulae, equations and calculations. Each one has a worked solution and a mark scheme showing where the marks go.

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