Question

final exam
c₂h₅oh + 3o₂ → 2co₂ + 3h₂o + 1367 kj
what is the ratio between ethanol
and energy of the reaction?
? mole c₂h₅oh
— kj
fill in the green blank.

Explanation:

Step1: Analyze the reaction

The given reaction is $\ce{C2H5OH + 3O2 -> 2CO2 + 3H2O + 1367 kJ}$. From the stoichiometry of the reaction, 1 mole of $\ce{C2H5OH}$ (ethanol) reacts to produce 1367 kJ of energy (since the energy is on the product side, it's a release, so the energy change is -1367 kJ for the reaction as written, but we focus on the mole ratio of ethanol to energy).

Step2: Determine the ratio

The coefficient of $\ce{C2H5OH}$ is 1, meaning 1 mole of ethanol is involved in the reaction that releases 1367 kJ. So the ratio of moles of ethanol to the energy (in kJ) is 1 mole of $\ce{C2H5OH}$ per 1367 kJ (with the energy being negative as it's released, but the green blank is for the moles of ethanol, which is 1).

Answer:

1