Equation
balancer
Coefficients are solved with exact fractions, not searched for. If an equation cannot be balanced, or can be balanced more than one way, you get told that instead of a wrong answer.
Use -> or = for the arrow. States are optional: write (aq), (s), (l), (g) and they will be used instead of inferred ones.
Examples
Balanced equation
C3H8+5O2→3CO2+4H2O
CombustionRedox
A fuel reacts with oxygen. Complete combustion of a hydrocarbon always gives carbon dioxide and water.
Carbon is oxidised and oxygen is reduced.
Atom count check
| Element | Left | Right | Match |
|---|---|---|---|
| C | 3 | 3 | |
| H | 8 | 8 | |
| O | 10 | 10 |
Mass check
Reactant mass204.087 g/mol
Product mass204.087 g/mol
Difference0.0000
Mass is conserved because atoms are. Any residue here is rounding in the tabulated atomic masses, not lost matter.
Ionic equations
Nothing here dissolves into ions, so there is no ionic form to write. Ionic equations apply to strong electrolytes in water.
Species
| Formula | Name | Coefficient | Molar mass |
|---|---|---|---|
| C3H8 | Propane | 1 | 44.097 |
| O2 | Oxygen | 5 | 31.998 |
| CO2 | Carbon dioxide | 3 | 44.009 |
| H2O | Water | 4 | 18.015 |