# How does the entropy change in the reaction 2C_3H_6(g) + 9O_2(g) -> 6CO_2(g) + 6H_2O(g)?

You has $12 \cdot m o l$ of gaseous products, and $11 \cdot m o l$ of gaseous reactants. $\Delta {S}^{\circ}$, which could certainly be approached quantitiatively given ${S}^{\circ}$ for products and reactants, would certainly be POSITIVE.