THT Use the given information and Hess's law to show how the enthalpy of reaction can be determined for the following reaction:

$P_4{O}_{10}(s)+6PC{l}_5(s)10C{l}_{3}PO(g)$

$(1)P_4(s)+6C{l}_2(g)4PC{l}_3(l)H^o=-1272kJ$

$(2)P_4(s)+5O_2(g)P_4{O}_4(s)H^{**}=-2915kl$

$(3)PC{l}_3()+C{l}_2(g)PC{l}_5(s)H^2=-125kJ$

$(4)PC{l}_3(l)+\frac{1}{2}{O}_2(g)C{l}_{3}PO(g)H^n=-267k$