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Calculations involving masses

Calculations involving masses

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Question 80

When pink hydrated cobalt(II) chloride is heated, it undergoes thermal decomposition to form blue anhydrous cobalt(II) chloride and water vapour:

CoCl2⋅6H2O(s)→CoCl2(s)+6H2O(g) \text{CoCl}_2\cdot6\text{H}_2\text{O}(\text{s}) \rightarrow \text{CoCl}_2(\text{s}) + 6\text{H}_2\text{O}(\text{g}) CoCl2​⋅6H2​O(s)→CoCl2​(s)+6H2​O(g)

In an experiment, a student heats 6.500 g6.500\text{ g}6.500 g of hydrated cobalt(II) chloride. After the reaction is complete, the mass of the remaining anhydrous solid is 3.550 g3.550\text{ g}3.550 g.

Calculate the mass of water vapour that has been released into the atmosphere. Give your answer to three significant figures.

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Calculations involving masses Questions

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

258 exam-style questions on Edexcel GCSE Chemistry Calculations involving masses. Each one has a worked solution and a mark scheme showing where the marks go.

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