Q$23$ Given the following thermochemical equations, calculate the standard enthalpy of formation for propane, $C_3{H}_8(g).$

$C(s)+O_2(g)C{O}_2(g),H_r=-393kJmo{l}^{-1}$

$H_2(g)+\frac{1}{2}{O}_2(g)H_{2}O(l),H_r=-286kJmo{l}^{-1}$

$C_3{H}_8(g)+5O_2(g)3C{O}_2(g)+4H_{2}O(l),H_r=-2452kJmo{l}^{-1}$

a$.-3131kJmo{l}^{-1}$

b$.129kJmo{l}^{-1}$

c$.4775kJmo{l}^{-1}$

d$.-1773kJmo{l}^{-1}$

e$.0kJmo{l}^{-1}$