Determine the entropy change for the combustion of gaseous propane, C3H8, under

Question

Determine the entropy change for the combustion of gaseous propane, C3H8, under standard state conditions to give gaseous carbon dioxide and water. Answer is 100.6 J/K but I need an explanation please! Determine the entropy change for the combustion of gaseous propane, C3H8, under standard state conditions to give gaseous carbon dioxide and water. Answer is 100.6 J/K but I need an explanation please! Determine the entropy change for the combustion of gaseous propane, C3H8, under standard state conditions to give gaseous carbon dioxide and water. Answer is 100.6 J/K but I need an explanation please!

Explanation / Answer

       C3H8(g) +    5O2(g)     ----->    3CO2(g) + 4 H2O(g)

from standard data, the standard entropy of each component is taken. and calculated the DS0rxn

DS0 rxn =   (4*DS0 H2O + 3*DS0 CO2 ) -( DS0C3H8 + 5*DS0 O2)

               = (4*188.7 + 3*213.6) - ( 269.9 + 5*205.0)

               = 100.7 j/k

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