Problem: Calculate ΔS˚rxn for the balanced chemical equation2 H2S(g) + 3 O2(g)  →  2 H2O(g) + 2 SO2(g)Standard enthalpies for selected substances at 25oC SubstanceΔS˚ (J/(mol•K))O2(g)205.2SO2(g)248.2SO3(g)256.8H2O(g)188.8H2S(g)205.8

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FREE Expert Solution

We are asked to calculate ΔS˚rxn for the balanced chemical equation 2 H2S(g) + 3 O2(g)  →  2 H2O(g) + 2 SO2(g)


Calculate ΔS˚rxn using the equation below: 

ΔS˚rxn = S˚products - S˚reactants


Values needed: 

S˚ of H2S(g)  = 205.8 J/(mol•K)

S˚ of O2(g)  = 205.2 J/(mol•K)

S˚ of H2O(g)  = 188.8 J/(mol•K)

S˚ of SO2(g)  = 248.2 J/(mol•K)


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Problem Details

Calculate ΔS˚rxn for the balanced chemical equation

2 H2S(g) + 3 O2(g)  →  2 H2O(g) + 2 SO2(g)

Standard enthalpies for selected substances at 25o

SubstanceΔS˚ (J/(mol•K))
O2(g)205.2
SO2(g)248.2
SO3(g)256.8
H2O(g)188.8
H2S(g)205.8

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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 Entropy concept. You can view video lessons to learn Entropy. Or if you need more Entropy practice, you can also practice Entropy practice problems.

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Based on our data, we think this problem is relevant for Professor Fan's class at UARK.