Discussion
The sequence of fossil fuels in the order of higher to lower heating value is as follows :
Answer: B
Heating values per unit mass run from hydrogen, at about 120 to 140 MJ per kg, through natural gas at about 50, petroleum at about 42 to 45 and coal at about 24 to 30. So the descending order is hydrogen, natural gas, petroleum, coal. The first option reverses the whole order, the third puts coal above natural gas and petroleum, and the fourth places hydrogen last although it has by far the highest energy per kilogram.
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