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Date May 2017 Marks available 1 Reference code 17M.3.sl.TZ1.16
Level SL Paper 3 Time zone TZ1
Command term Outline Question number 16 Adapted from N/A

Question

Coal is often converted to liquid hydrocarbon fuels through initial conversion to carbon monoxide and hydrogen.

State how these gases are produced, giving the appropriate equation(s).

[2]
a.

Outline how the carbon monoxide is then converted to a hydrocarbon fuel.

[1]
b.

Markscheme

heat/react with «oxygen and» water/steam

C + H2O → CO + H2
OR
3C + O2 + H2O → H2 + 3CO
OR
2C + O2 → 2CO AND C + H2O → H2 + CO
OR
C + O2 → CO2 AND C + CO2 → 2CO AND C + H2O → H2 + CO

 

M1 requires concept of heat.

[2 marks]

a.

«Fischer-Tropsch» catalytic reduction of carbon monoxide with hydrogen
OR
(2n + 1)H2 + n\(\,\)CO → CnH(2n + 2) + n\(\,\)H2O
OR
reduction of carbon monoxide to methanol AND catalytic dehydration
OR
2H2 + CO + CH3OH AND n\(\,\)CH3OH → CnH2n + n\(\,\)H2O

 

If equation is given for a specific alkane or alkene, it must be a liquid (n > 4).

[1 mark]

b.

Examiners report

[N/A]
a.
[N/A]
b.

Syllabus sections

Options » C: Energy » C.2 Fossil fuels
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