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Controlling reactions

Controlling reactions

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Question 7

A student investigates the thermal decomposition of sodium chlorate(V) to produce sodium chloride and oxygen gas:

2NaClO3(s)→MnO2(s)2NaCl(s)+3O2(g) 2\text{NaClO}_3(\text{s}) \xrightarrow{\text{MnO}_2(\text{s})} 2\text{NaCl}(\text{s}) + 3\text{O}_2(\text{g}) 2NaClO3​(s)MnO2​(s)​2NaCl(s)+3O2​(g)

The student heats a mixture containing 12.55 g of sodium chlorate(V) and 3.50 g of manganese(IV) oxide as a catalyst. During the reaction, 3.84 g of oxygen gas is evolved and escapes from the reaction vessel.

What is the mass of the manganese(IV) oxide catalyst remaining in the vessel at the end of the reaction?

A

3.50 g3.50\text{ g}3.50 g

B

12.21 g12.21\text{ g}12.21 g

C

8.71 g8.71\text{ g}8.71 g

D

0.00 g0.00\text{ g}0.00 g

Markscheme

Controlling reactions Questions

  1. GCSE
  2. /Chemistry
  3. /Controlling reactions

31 exam-style questions on OCR GCSE Chemistry Controlling reactions. Each one has a worked solution and a mark scheme showing where the marks go.

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