Without doing any calculations, match the following thermodynamic properties with their appropriate numerical sign for the following exothermic reaction.
2C2H6(g) + 7O2(g) → 4CO2(g) 6H2O(g)
a. ΔHrxn > 0
b. ΔSrxn < 0
c. ΔGrxn = 0
d. ΔSuniverse > 0 low T, < 0 high T
< 0 low T, > 0 high T
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