Stoichiometry Calculator

The Stoichiometry Calculator is a free online application that generates a balanced equation for a chemical equation. The online stoichiometry calculator tool speeds up computations and displays the balanced equation in a fraction of a second.

What is the purpose of Stoichiometry?

The quantitative link between reactants and products in a chemical process is expressed using stoichiometry. The stoichiometric coefficients in a balanced equation represent the molar ratios in the reaction. It enables for the prediction of particular quantities such as a gas's product or molar mass, percent yield, and so on.

  • For the first letter, use uppercase, and for the second letter, use lowercase.
  • Before and after the + and -> signs, there must be one space.

Chemical Reaction

  • When a chemical change happens, a chemical reaction occurs. Ex: Magnesium (Mg) + Oxygen (O) = Magnesium oxide, for example (MgO).
  • The reactants are the components that change chemically during the reaction.
  • The new substances generated during the reaction are referred to as products.
  • Magnesium (Mg) + Oxygen (O) = Magnesium oxide, for example (MgO). Magnesium and oxygen are the reactants in this equation, while magnesium oxide is the result.

Chemical Reactions in Balance

Mass cannot be generated or destroyed in a chemical reaction, according to the rule of conservation of mass. That is, the total mass of elements present in a chemical reaction's products must equal the total amount of elements present in the reactants.

Before and after a chemical reaction, the number of atoms on each element remains constant. For instance:- (i) 2Mg + O2 à 2MgO (ii) Zn + H2SO4 à ZnSO4 + H2

Stoichiometry chemical equation of balance

  • CH4(g) + 2O2 (g) à CO2 (g) + 2H2O (g).
  • The information obtained from the aforesaid reaction is as follows
    • When one mole of CH4 (g) interacts with two moles of O2 (g), one mole of CO2 (g) and two moles of H2O are produced (g).
    • When one molecule of CH4 (g) interacts with two molecules of O2 (g), one molecule of CO2 (g) and two molecules of H2O are produced (g).
    • 16 g CH4 (g) interacts with 232 g O2 (g) to produce 44 g CO2 (g) and 218 g H2O. (g).

Examples on Stoichiometry

Calculate how much water (g) is created when 16 g of methane is burned?


The balanced equation for methane combustion is CO2 (g) + 2H2O à CH4 (g) + 2O2 (g) (g)

1 One mole is equal to 16 g of CH4.

Using the equation above, 1 mol of CH4 (g) yields 2 mol of H2O. (g)

2 mol water (H2O) equals 2 (2+16) = 2 18 = 36 g

1 mol H2O = 18 g H2O ⇒ (18g H2O)/ (1 mol H2O) = 1

As a result, 2 mol H2O (18g H2O)/ (1 mol H2O)

= 36 g H2O = 2 18 g H2O

FAQ’s on Stoichiometry Calculator

1. What is meant by Stoichiometry?

Stoichiometry is used to express the quantitative relationship between reactants and products in the chemical equation.

2. 1. What is the stoichiometric calculation, and how does it work?

The majority of stoichiometric calculations are based on chemical formulas. The mass of a material is defined as the total of the atomic weights of all the atoms in the molecule. The mass of Na2S, for example, is computed as 2(23) + 1(32) = 78.

3. What method do you use to calculate the mole ratio?

Divide the number of moles of each element by the least number of moles to find the ratio or moles of each element. Because there are fewer moles of oxygen than any other element, we'll use one mole to calculate the ratios.