Calculate the standard molar entropy change for the formation of gaseous propane `(C_(3)H_(8))` at `293K`.
`3C("graphite") +4H_(2)(g) rarr C_(3)H_(8)(g)`
Standard molar entropies `S_(m)^(Theta) (JK^(-1)mol^(-1))`are:
`C("graphite") = 5.7, H_(2)(g) = 130.7,C_(3)H_(5)(g) = 270.2`