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Chemical formulae, equations and calculations

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Question 73

Sulfuric acid can be manufactured from sulfur in a three-stage industrial process.

stage 1: sulfur is burned in oxygen to form sulfur dioxide

S+O2→SO2 \text{S} + \text{O}_2 \rightarrow \text{SO}_2 S+O2​→SO2​

stage 2: the sulfur dioxide is reacted with more oxygen to form sulfur trioxide

2SO2+O2→2SO3 2\text{SO}_2 + \text{O}_2 \rightarrow 2\text{SO}_3 2SO2​+O2​→2SO3​

stage 3: the sulfur trioxide is reacted with water to form sulfuric acid

a.

Write a chemical equation for the reaction of stage 3 that forms sulfuric acid (H2SO4\text{H}_2\text{SO}_4H2​SO4​) from sulfur trioxide (SO3\text{SO}_3SO3​) and water (H2O\text{H}_2\text{O}H2​O).

[1]
b.

A mass of 80 tonnes80\text{ tonnes}80 tonnes of sulfur is reacted with oxygen in stage 1.

Calculate the maximum mass, in tonnes, of sulfur trioxide (SO3\text{SO}_3SO3​) that can be produced in stage 2.

[1 tonne=1.0×106 g] [1\text{ tonne} = 1.0 \times 10^6\text{ g}] [1 tonne=1.0×106 g]
[5]
c.

Calculate the minimum volume at rtp, in cubic decimetres (dm3\text{dm}^3dm3), of oxygen required to completely react with 160 tonnes160\text{ tonnes}160 tonnes of sulfur dioxide in stage 2.

[1 mol of gas at rtp has a volume of 24 dm3] [1\text{ mol of gas at rtp has a volume of } 24\text{ dm}^3] [1 mol of gas at rtp has a volume of 24 dm3]
[4]

Chemical formulae, equations and calculations Questions

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