Problem: For the reaction:2KClO3(s) → 2KCl(s) + 3O2(g)Calculate ΔG°rxn at 25°C.Express your answer using one decimal place.
FREE Expert Solution
FREE Expert Solution
We’re being asked to determine the Gibbs free energy (ΔG°_{rxn}) at 25°C for the given reaction:
2 KClO_{3 }(s) → 2 KCl (s) + 3 O_{2 }(g)
We’re given the ΔH˚_{f} and S˚ of each reactant and product:
Substance | ΔH˚_{f} (kJ/mol) | S˚ (J/mol • K) |
KClO_{3 }(s) | –397.7 | 143.1 |
KCl (s) | –436.5 | 82.6 |
O_{2 }(g) | 0 | 205.2 |
We can use the following equation to solve for ΔG˚_{rxn}:
$\overline{){\mathbf{\Delta G}}{{\mathbf{\xb0}}}_{{\mathbf{rxn}}}{\mathbf{=}}{\mathbf{\Delta H}}{{\mathbf{\xb0}}}_{{\mathbf{rxn}}}{\mathbf{-}}{\mathbf{T\Delta S}}{{\mathbf{\xb0}}}_{{\mathbf{rxn}}}}$
For this problem, we need to do the following steps:
Step 1: Calculate ΔH˚_{rxn}.
Step 2: Calculate ΔS˚_{rxn}.
Step 3: Use ΔH˚_{rxn} and ΔS˚_{rxn} to calculate for ΔG˚_{rxn}.
Problem Details
For the reaction:
2KClO_{3}(s) → 2KCl(s) + 3O_{2}(g)
Calculate ΔG°_{rxn} at 25°C.
Express your answer using one decimal place.
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Gibbs Free Energy concept. You can view video lessons to learn Gibbs Free Energy Or if you need more Gibbs Free Energy practice, you can also practice Gibbs Free Energy practice problems .
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Our expert Chemistry tutor, Rae-Anne took 9 minutes to solve this problem. You can follow their steps in the video explanation above.
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Based on our data, we think this problem is relevant for Professor Esfandiari's class at SJSU.