Question

- The same mass of 5 different substances was used to heat the same mass of water in a simple

calorimeter. The results are shown below. Based on these results, which of these substances made
the worst fuel?

Answer 1

Substance ΔH (kJ/g)

Coal -40.23

Hydrogen -242.82

Methanol -252.45

Octane -43.99

Propane -214.46

Step-by-step explanation:

Methanol made the worst fuel because it has the lowest ΔH value of -252.45 kJ/g, which means that it releases the lowest amount of energy when used as a fuel. The other substances have higher ΔH values, so they produce more heat energy when burned.