How does the entropy change in the reaction #2C_3H_6(g) + 9O_2(g) -> 6CO_2(g) + 6H_2O(g)#? Chemistry Thermochemistry Entropy 1 Answer anor277 Jun 8, 2017 Answer: Would you not expect the entropy to increase? Explanation: You has #12*mol# of gaseous products, and #11*mol# of gaseous reactants. #DeltaS^@#, which could certainly be approached quantitiatively given #S^@# for products and reactants, would certainly be POSITIVE. Related questions How does entropy change with pressure? How do you calculate entropy? How do you calculate entropy change? How do you calculate entropy of vaporization? Why does entropy increase with an increase in temperature? Why is entropy of the universe increasing? Can entropy be zero? How do free energy and entropy relate? When does entropy increase? What is the difference between entropy and enthalpy? See all questions in Entropy Impact of this question 260 views around the world You can reuse this answer Creative Commons License