Discussion
Briquettes of calorific value \( 15 \) MJ/kg replace fuel oil at \( 42 \) MJ/kg. To replace \( 1 \) tonne of oil requires
Answer: B
Correct answer: 2.8 tonnes of briquettes
Match the energy rather than the mass:
\[ \frac{42}{15} = 2.8 \]
So 2.8 tonnes of briquettes deliver the energy of one tonne of oil. The ratio is what any fuel substitution must be judged on, and it has consequences beyond the purchase price: nearly three times the mass must be transported, stored and handled, and the ash from it must be disposed of, none of which arises with oil.
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