BPJ Code

∆Gf = ∆Hf - T.∆Sf

∆Hf and ∆Sf can be approximated by various formulae with parameters fitted to calorimetry data.

From ∆G, derive the equilibrium constant via the identity:

∆G = -RT ln Keq

Click on the reactants or products in the chemical equation below to choose different species. You need to balance the equation yourself; the garbage-in, garbage-out principle applies.

Estimates are valid only for temperatures within the intersection of ranges of all involved molecules' thermochemistry model formulae. For most species supported here that range is 298K - 6000K.

Take note of the states of matter of the available substances. They may not always correspond with STP. The brotherhood of the benzene ring will know what you did.


(∆H = ?kJ/mol)
Equilibrium constant: blah. For the reverse reaction: blah
Ammonia NH3NH3 (g)
Steam H2OH2O (g)
Water H2O(l)H2O (l)
Carbon dioxide CO2CO2 (g)
Carbon monoxide COCO (g)
Carbon (graphite) C(graphite)C (s, graphite)
Methanol CH3OHCH3OH (g)
Formaldehyde CH2OCH2O (g)
Sulfur dioxide SO2SO2 (g)
Sulfur trioxide SO3SO3 (g)
Nitric oxide NONO (g)
Nitrogen dioxide NO2NO2 (g)
Hydrogen peroxide H2O2H2O2 (g)
Sulfuric acid H2SO4H2SO4 (g)
Nitric acid HNO3HNO3 (g)
Hydrochloric acid HClHCl (g)
Methane CH4CH4 (g)
Ethene C2H4C2H4 (g)
Propane C3H8C3H8 (g)
Propene C3H6C3H6 (g)
Nitrogen N2N2 (g)
Hydrogen H2H2 (g)
Oxygen O2O2 (g)
Chlorine Cl2Cl2 (g)
Calcium oxide CaOCaO (s)
Calcium carbonate (calcite) CaCO3CaCO3 (s)
Iron (liquid) Fe(l)Fe (l)
Iron (solid) Fe(s)Fe (s)
Hematite Fe2O3Fe2O3
Magnetite Fe3O4Fe3O4
Copper (liquid) Cu(l)Cu (l)
Copper (solid) Cu(s)Cu (s)
Cupric oxide CuO(s)CuO (s)
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