The heat of formation (AHf) of solid oxalic acid acid, C,H,04(), is -829.7 kJ. Which of the following represents the thermochemical equation for the enthalpy of formation of C,H,O4(s)? Select one: a. 2 C(s) + 2 H(g) + 4 0(g) - CH20,(3) AH = -829.7 kJ b. 2 C(s) + H2(8) +20,() - C,H,O,(8) AH = -829.7 kJ c. C(s) + 1/2 H.(8) + 0,(g) 1/2 C,H,O,(s) AH = -829.7 kJ d. C(s) + H.(g) + 0,8) - C,H,O,(8) AH = -829.7 kJ