Equations for enthalpy changes

H_(products) - H_(reactants)

Enthalpy change

H_(reactants)- H_(products)

1 atm, 298K, 1moldm-3

101kPa, 25oC, 1moldm-3

101 atm, 25K, 1moldm-3

1kPa, 298oC, 1moldm-3

CH4 + O2--> C+ H2O

CH4(g) + O2(g)--> C(s)+ H2O(l)

C(s) + O2(g) --> CO2(g)

C + O2--> CO2

CH4(s) + O2(g) --> CO2(g) + H2O(g)

CH4(g) + O2(g)--> C(s)+ H2O(l)

CH4(s) + 2O2(g) --> CO2(g) + 2H2O(g)

CH4(g) + 2O2(g) --> CO2(g) + 2H2O(l)

C + O2 --> CO2

CH4(g) + O2(g)--> C(s)+ H2O(l)

CH4 + O2--> C+ H2O

C(s) + O2(g)--> CO2(g)

Delta H c

Delta H f

Delta H r

$$\Delta Hf\degree\left(H2\right)$$  

$$\Delta Hf\degree\left(H2O\right)$$

$$2\ x\ \Delta Hf\degree\left(H2\right)$$

$$2\ x\ \Delta Hf\degree\left(H2O\right)$$

$$\Delta Hc\degree\left(H2\right)$$  

$$\Delta Hc\degree\left(H2O\right)$$

$$2\ x\ \Delta Hc\degree\left(H2\right)$$

$$2\ x\ \Delta Hc\degree\left(H2O\right)$$

BaSO4>BaCO3>BaO>BaCl2

BaO>BaCl2>BaCO3>BaSO4

BaO>BaCO3>BaSO4>BaCl2

0

10

2

100