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