Use Bond Enthalpies Table to estimate the enthalpy change for the reaction H2(g)+Cl2(g)2HCl(g)kJ184184kJkJ192kJ192 21 1.50 P ? What is the percentage of C in Na2CO3 50.8%45.3%11.3%43.4% Use Bond Enthalpies Table to estimate the enthalpy change for the reaction H2(g)+Cl2(g)2HCl(g)kJ184184kJkJ192kJ192 21 1.50 P ? What is the percentage of C in Na2CO3 50.8%45.3%11.3%43.4%