A chemical equation refers to a written representation of chemical reactions in symbolic form. All chemicals are designated by letters, which means that letters that depict an element are called elemental letters. Similar to a mathematical equation format, the reacting chemicals are on the left side of the equation, and the resulting chemical is on the right. According to the law of conservation, the number of atoms present in the resulting chemical should be equal to the atoms in the reacting chemicals.
Although the law had been in practice since ancient times, the principle of conservation of mass had first been outlined by Mikhail Vasilyevich Lomonosov.
This law is applied to suggest that mass in an isolated physical condition can be neither created nor destroyed by chemical reactions or physical transformations, preserving the number of atoms and mass in each reaction.
The equation can be represented as:
Number of atoms of element in the reactant
=
Number of atoms of element in the product
To put this law into perspective, for eg,
2H2 + O2 → 2H2O
To create a balanced equation, there are several steps to balance chemical equations that should be followed. The process
Step 1: Write down the chemical equations to balance. In this example, we would be looking at the chemical reaction using propane ( C3H8) and oxygen (O2) to create carbon dioxide (CO2) and water (H2O)
We can symbolize the unbalanced chemical equation as - C3H8 + O2 → CO2 + H2O
Step 2: The number of atoms present in each element on the reactant side and the resulting side must be compared.
Tabulated below are the total atoms on both sides of the equation:
Step 3:
We repeat step 3 until the number of atoms is equal on both sides.
Step 4:
After we have balanced the hydrogen atoms, we move on to balancing oxygen atoms. Since there are 10 oxygen atoms in the product equation, the reactant side must also contain the same number.
All O2 molecules have 2 oxygen atoms. Hence, we would assign 5 as the stoichiometric coefficient to the O2. The final equation is depicted in the following table:
Step 5:
The final balanced equation that we have is C3H8 + 5O2 → 3CO2 + 4H2O
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