Given the following reactions 2S (s)+ 3O₂ (g)→ 2SO₃ (g)ΔH = -790 kJ S (s)+ O₂ (g)→ SO₂(g)ΔH = -297 kJ The enthalpy of the reaction in which sulfur dioxide is oxidized to sulfur trioxide 2SO₂ (g)+ O₂ (g)→ 2SO₃ (g) Is ________ kJ. A)196 B)-196 C)1087 D)-1384 E)-543

Question

Quizplus · Accepted Answer

The enthalpy of the target reaction can be found by manipulating the given reactions and their enthalpies. The first reaction is as given, and the second reaction needs to be multiplied by 2 to match the target reaction's stoichiometry. The enthalpy changes scale accordingly. Therefore, the enthalpy for the target reaction is the sum of the enthalpy of the first reaction and twice the enthalpy of the second reaction: -790 kJ + 2(-297 kJ) = -790 kJ - 594 kJ = -1384 kJ. However, since the target reaction is the reverse of the combination of these two reactions, its enthalpy change is the opposite in sign, making it +1384 kJ. This was a mistake in my calculation process. Correctly, to find the enthalpy of the desired reaction, you subtract the sum of the enthalpies of the given reactions from 0 because you are essentially reversing the first reaction to get the desired products. This means the correct calculation should directly use the given reactions without needing to reverse them, leading to the correct answer being the direct outcome of manipulating the given reactions to achieve the desired reaction. The correct calculation involves directly using the given reactions to find the enthalpy of the target reaction without reversing them, which was my mistake in explaining the process. The correct enthalpy change for the target reaction is actually found by adding the enthalpies of the given reactions as they are used to arrive at the target reaction, not by reversing them. Therefore, the correct answer involves correctly manipulating the given reactions and their enthalpies to find the enthalpy change of the target reaction without the incorrect assumption of reversing the first reaction.

Given the Following Reactions 2S (S)+ 3O2 (G)→ 2SO3 (G)ΔH

Given the Following Reactions 2S (S)+ 3O₂ (G)→ 2SO₃ (G)ΔH