Multiple Choice
Calculate the ∆Hrxn for
Given the following set of reactions:
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Hess's Law
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Calculate the ∆Hrxn for the following thermochemical equation:
When given the following:
A
-296.8 kJ
B
-148.4 kJ
C
148.4 kJ
D
296.8 kJ
Verified step by step guidance1
Identify the given thermochemical equation: 2 S (s) + 3 O2 (g) → 2 SO3 (s) with ΔHrxn = −296.8 kJ.
Notice that the target equation is S (s) + 1.5 O2 (g) → SO3 (s). This is exactly half of the given equation.
To find the ΔHrxn for the target equation, divide the ΔHrxn of the given equation by 2, because the stoichiometry of the target equation is half of the given equation.
Calculate the ΔHrxn for the target equation by dividing −296.8 kJ by 2.
The result of this calculation will give you the ΔHrxn for the reaction S (s) + 1.5 O2 (g) → SO3 (s).
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