The Combustion Reaction Calculator is a chemistry tool that balances combustion equations and calculates the amounts of reactants and products involved when a substance burns in oxygen. It helps determine how much oxygen is required and how much carbon dioxide, water, and energy are produced during combustion.
This calculator is widely used in chemistry education, environmental studies, fuel engineering, and industrial process design to simplify stoichiometric combustion calculations.
A combustion reaction is a chemical process in which a substance reacts rapidly with oxygen, releasing heat and often light. For hydrocarbons, the general combustion reaction is:
Fuel + Oxygen → Carbon Dioxide + Water + Energy
Combustion reactions are central to energy production, engines, heating systems, and environmental emissions studies.
Below are the fundamental relationships used in combustion calculations:
General Hydrocarbon Combustion:
CxHy + (x + y/4) O₂ → x CO₂ + (y/2) H₂O
Mole Relationship:
n = m / M
Mass Calculation:
m = n × M
Stoichiometric Ratio:
Reactant/Product ratio derived from balanced equation coefficients
Where:
x, y = number of carbon and hydrogen atoms
n = number of moles
m = mass
M = molar mass
These equations determine how much oxygen is required and how much product forms.Let's calculate the combustion of methane (CH₄).
Balanced Equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
Suppose we burn 16 g of CH₄.
Step 1: Convert mass to moles
Moles CH₄ = 16 g ÷ 16 g/mol = 1 mol
Step 2: Use mole ratios
1 mol CH₄ reacts with 2 mol O₂
Step 3: Convert oxygen moles to mass
Mass O₂ = 2 × 32 g/mol = 64 g
Result: Burning 16 g of methane requires 64 g of oxygen and produces 44 g of CO₂ and 36 g of H₂O.