Thermochemistry

Goal: To predict ?H for every reaction, even if it cannot be carried out in the laboratory
The heat of reaction ?Hrx is the ?H for the isothermal reaction at constant pressure.
e.g. Fe2O3(s,T,p) + 3H2(g,T,p) = 2Fe(s,T,p) + 3H2O(l,T,p)
( , )= 2 Fe (Tp )+ 3 HO 2 (Tp )? 3 H2 (T p , )?H 23 ( , )
?HrxTp H, H , H FeO Tp
[?H =H (products )?H (reactants ] )
rx
We cannot know H values because enthalpy, likeGoal: To predict ?H for every reaction, even if it cannot be carried out in the laboratory
The heat of reaction ?Hrx is the ?H for the isothermal reaction at constant pressure.
e.g. Fe2O3(s,T,p) + 3H2(g,T,p) = 2Fe(s,T,p) + 3H2O(l,T,p)
( , )= 2 Fe (Tp )+ 3 HO 2 (Tp )? 3 H2 (T p , )?H 23 ( , )
?HrxTp H, H , H FeO Tp
[?H =H (products )?H (reactants ] )
rx
We cannot know H values because enthalpy, likeGoal: To predict ?H for every reaction, even if it cannot be carried out in the laboratory
The heat of reaction ?Hrx is the ?H for the isothermal reaction at constant pressure.
e.g. Fe2O3(s,T,p) + 3H2(g,T,p) = 2Fe(s,T,p) + 3H2O(l,T,p)
( , )= 2 Fe (Tp )+ 3 HO 2 (Tp )? 3 H2 (T p , )?H 23 ( , )
?HrxTp H, H , H FeO Tp
[?H =H (products )?H (reactants ] )
rx
We cannot know H values because enthalpy, like