Problem: Consider the following reaction at 298 K: C(graphite) + 2H2(g) → CH4(g)       ΔH° = -74.6 kJCalculate the following quantities.ΔSsys = ___ J/KΔSsurr = ___ J/KΔSuniv = ___ J/K

FREE Expert Solution

The total entropy or the entropy of the universe is also related to the can be calculated using the entropy of the system (reaction) and entropy of the surroundings:

Suniv=Ssystem+Ssurroundings


Step 1: Calculate ΔS°system.

ΔS°sys = ΔS°rxn

ΔS° Cgraphite = 5.686 J/(mol•K)

ΔS° H2 = 130.6 J/(mol•K)

ΔS° CH4 = 186.1 J/(mol•K)

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Problem Details

Consider the following reaction at 298 K: 

C(graphite) + 2H2(g) → CH4(g)       ΔH° = -74.6 kJ

Calculate the following quantities.

ΔSsys = ___ J/K

ΔSsurr = ___ J/K

ΔSuniv = ___ J/K

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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 Second and Third Laws of Thermodynamics concept. If you need more Second and Third Laws of Thermodynamics practice, you can also practice Second and Third Laws of Thermodynamics practice problems.