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:
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)
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