The heat of combustion is a difference of enthalpy (DH) observed in the chemical
ID: 938438 • Letter: T
Question
The heat of combustion is a difference of enthalpy (DH)
observed in the chemical reaction between one mole of a substance (the
fuel) and oxygen (the oxidizer), forming gas
carbon dioxide and water vapor.
The following chart shows the enthalpy of combustion, in certain
temperature for ethane, propane, butane, pentane and
hexane.
According to the graph can estimate that: (Justify your answer, explaining the reason for this school alternative)
(A) 1000 kcal are released in the combustion of 1 mole of hexane.
(B) 650 kcal are necessary for the combustion of 1 mole of
butane.
(C) 700 kcal are necessary for the combustion of 2 moles of
ethane.
(D) 500 kcal are released in combustion 3 propane moles.
(E) 1600 kcal are released in combustion 2 pentane moles.
Explanation / Answer
(B) 650 kcal are necessary for the combustion of 1 mole of butane.
In the graph it is showing that the butane containing 4 carbons releases 650 kcal of energy.
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