Determine the enthalpy of this reaction, using the enthalpies for the three reactions below.
C2H4 (g) + 4 Cl2 (g) ------>C2Cl4 (I) + 4 HCl (g)
1/2C2 Cl4 (I) + Cl2 ------>CCl4(I) Δ H = -109 kJ
C2 H6 (g) ------> C2H4 (g) + H2(g) Δ H = + 157 kJ
C2H6 (g) + 6 Cl 2 (g) --> 2CCl4 (I) + 4 HCl (g) + H2(g) Δ H = -534 kJ