Given the following reactions:
2 S (s) + 3 O2 (g) ⟶ 2 SO3 (g) ΔH1= LaTeX: -− 790 kJ
S (s) + O2 (g) ⟶ SO2 (g) ΔH2= LaTeX: -−297 kJ
What is the enthalpy change of the following reaction? 2 SO3 (g) ⟶ 2 SO2 (g) + O2 (g) ΔH3=?
Lets number the reaction as 1, 2, 3 from top to bottom
required reaction should be written in terms of other reaction
This is Hess Law
required reaction can be written as:
reaction 3 = -1 * (reaction 1) +2 * (reaction 2)
So, ΔHo rxn for required reaction will be:
ΔHo rxn = -1 * ΔHo rxn(reaction 1) +2 * ΔHo rxn(reaction 2)
= -1 * (-790.0) +2 * (-297.0)
= 196.0 KJ
Answer: 196.0 KJ
Given the following reactions: 2 S (s) + 3 O2 (g) ⟶ 2 SO3 (g) ΔH1= LaTeX: -− 790 kJ S (s) + O2 (g) ⟶ SO2 (g) ΔH2= LaTeX:...
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