| Date | May 2014 | Marks available | 1 | Reference code | 14M.1.SL.TZ1.25 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 25 | Adapted from | N/A |
Question
A natural gas power station has an output of 600 MW and an efficiency of 50%. The mass of natural gas that is burned per second is 20kg. What is the energy density of natural gas?
A. 15 MJkg–1
B. 30 MJkg–1
C. 40 MJkg–1
D. 60 MJkg–1
Markscheme
D
Examiners report
Non-renewable fuels have been produced in the past and so can be produced again, so C represents a common misconception. The key to understanding what is meant by ‘non-renewable’ is consideration of the time scale of production and consumption.
Syllabus sections
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