AP Chemistry
6.6 Introduction to Enthalpy of Reaction
A student evaluates two fuels, fuel \(\text{X}\) and fuel \(\text{Y}\), for use in a portable stove. The molar mass and standard enthalpy of combustion, \(\Delta H^\circ_{\text{comb}}\), for each fuel are provided in the table below.
Assuming complete combustion under standard conditions, which of the following represents the ratio of the heat released by the combustion of \(1.00 \text{ g}\) of fuel \(\text{Y}\) to the heat released by the combustion of \(1.00 \text{ g}\) of fuel \(\text{X}\), \(\dfrac{q_{\text{Y}}}{q_{\text{X}}}\)?
| Fuel | Molar mass (\(\text{g/mol}\)) | \(\Delta H^\circ_{\text{comb}}\) (\(\text{kJ/mol}_{\text{rxn}}\)) |
|---|---|---|
| \(\text{X}\) | \(60.0\) | \(-1200\) |
| \(\text{Y}\) | \(30.0\) | \(-1800\) |
Assuming complete combustion under standard conditions, which of the following represents the ratio of the heat released by the combustion of \(1.00 \text{ g}\) of fuel \(\text{Y}\) to the heat released by the combustion of \(1.00 \text{ g}\) of fuel \(\text{X}\), \(\dfrac{q_{\text{Y}}}{q_{\text{X}}}\)?
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