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AP Chemistry
6.6 Introduction to Enthalpy of Reaction
IntermediateMCQMathematicalProportional Analysis18.4k
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.

FuelMolar 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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