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Stoichiometry Calculator

Stoichiometry Calculator

Enter the chemical equation and the calculator will readily calculate the number of reactants and products involved in it.


Enter an Equation

H He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
Cs Ba La Hf Ta W Re Os Ir Pt Au Hg TI Pb Bi Po At Rn
Fr Ra Ac Rf Db Sg Bh Hs Mt Ds Rg Cn Nh FI Mc Lv Ts Og
Lanthanoids Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Actinoids Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr
SPACE 1 2 3 4 5 6 7 8 9 0 + = CLEAR

Table of Content

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Make use of this free gas stoichiometry calculator moles to grams that lets you calculate the relative amounts of reactants and products involved in a chemical reaction. The calculator helps you to know the exact number of moles or grams of the entities involved in a chemical equation.

So without wasting time, let’s get ahead and discuss what this particular chemical term is and how it affects the product formation in a chemical reaction.

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What Is Stoichiometry?

In terms of chemistry:

“The technique that helps to calculate the relative amounts of reactants and products in a balanced chemical reaction is known as stoichiometry”

Determining the stoichiometry of chemical reactions aids you to understand the chemistry of any reaction by comparing the amount of all entities present in it.

Stoichiometric Coefficients:

“In balanced chemical reactions, the numbers used to express the quantity of entities are called stoichiometry coefficients.”

You must remember in your mind that stoichiometric coefficients can be fractions or any ratio number. This is why whole numbers are always preferred so that the overall near to exact number of atoms or moles or grams could be represented to avoid complications in the calculations. Also for fast and most secure calculations, you may use this free solution stoichiometry calculator moles to grams absolutely for free.

Types of Stoichiometry:

Depending upon the concentration of parameters involved in a chemical reaction, following are the types of stoichiometry:

Moles To Moles Stoichiometry:

If you are given a reaction and ask to determine its mole-mole stoichiometry, then you need to follow the guide below:

  • The first step in most stoichiometry problems is to convert the units of reactants into the corresponding number of moles
  • After doing so, use the technique of the mole fraction to determine the moles of the wanted substance. You can also use another mole fraction calculator for this purpose.
  • Once you calculate the moles, convert them to the relative units of the products

You can also do such conversions by using this online mole to mole stoichiometry calculator.

Mass To Moles or Mass To Mass Stoichiometry:

Suppose you are given mass of substance only and asked to find the mass of the reactant. This could be done as follows:

  • Write down the balanced stoichiometry equations
  • Convert the given reactant mass in equivalent number of moles
  • Use the stoichiometry formula to find the moles of the desired product
  • Now after that, convert back he moles to the mass of the product item formed

Stoichiometry Example Problems:

Let’s resolve an example to clarify the concept of stoichiometry:

Example # 01:

Suppose you are experiencing a phenomenon like burning of oxygen gas with hydrogen for the formation of water. Now determine the exact mass of oxygen gas that may be required to burn one gram of hydrogen. Also, mention the water mass obtained at the end.


Carrying out stoichiometry conversion as below:

Step # 01:

The balanced chemical stoichiometry equations for the water formation reaction is as follows:

$$ 2H_{2} + O_{2} → 2H_{2}O $$

Step # 02:

Now you need to write the atomic and molecular masses of each and every atom involved in the reaction:

Atomic masses:

Hydrogen = 1

Oxygen = 16

For calculations and steps, tap the atomic mass calculator.

Molecular mass:

\(H_{2}\) = 2

\(O_{2}\) = 32

\(H_{2}O\) = 18

Here with the help of another molecular formula calculator, you can get to know the steps involved in calculating the molecular mass of any compound.

The above information can also be displayed in the following stoichiometry table:

Atomic Mass

Molecular Mass
H = 1

\(H_{2}\) = 2

O = 16

\(O_{2}\) = 32

Molecular Mass of Water = \(H_{2}O\) = 18

Step # 03:

Change the moles of the elements of the reaction equation.

Step # 04:

Now go for determining the actual mass of the compounds:

When 4 grams of the oxygen reacts with the 32 grams of the oxygen, it produces 36 grams of the water molecule. It means that we actually need to burn approximately 1 gram of the hydrogen gas by using the stoichiometry formula.

So at the end, we have:

1 gram of hydrogen reacts with 32/4 = 8 grams of the oxygen

It yields:

Mass of the water produced = 36/4 = 9 grams

You can also verify the values by using this best molarity stoichiometry calculator with formulas and equations.

How Solution Stoichiometry Calculator Works?

This section of the content is packed with a complete usage guide of this free stoichiometry converter. Let’s go through it together!


  • What you need to do here is to write the chemical reaction of your choice in the designated field. Also, you can load the pre-saved example reaction
  • After you are done with it, it’s time to hot the calculate button


The free stoichiometric equation solver determines the following results:

  • Determines the amount of reactant as well as the products in terms of moles and grams


Why is Stoichiometry difficult?

The technique of stoichiometry can be tricky enough. This is because for every reaction, you need to develop a certain strategy to compare the number of reactants and product atoms or molecules or even moles. This is why we have developed the best moles to grams stoichiometry calculator so that we may not feel any hurdle while carrying out such chemical computations.

What are the basic assumptions of stoichiometry?

A couple of major assumptions about stoichiometry are as follows:

  • No side chemical reaction reaction takes place
  • All the reactants are completely converted in to the products

What happens if you don’t balance a chemical equation?

It is very important to balance a given chemical reaction. This is because if you do not balance a reaction, you would not actually be able to get any chemical statistics about the products or reactants present.

Are atoms and molecules the same thing in stoichiometry?

Maybe or maybe not. As we know atoms are the smallest particles of matter that can not be seen with the naked eye. And when atoms combine, they form a molecule. In some cases where the molecules are made up of the same atom types, we can say the stoichiometric is defined in terms of the same atoms and molecules in the reaction. But if the situation is opposite to the discussion, then the situation does not hold. This free gas stoichiometry calculators also verifies the situation.

What factors does stoichiometry depend on to find the unknowns?

Stoichiometry of a chemical reaction depends upon a couple of factors. One is the numerator that is written above and is always unknown (stoichiometric coefficient X). The other one written in the denominator is the known (stoichiometric coefficient Y) parameter of the reactions.

What is the purpose of stoichiometry?

As a general matter, the stoichiometry tells us what exact quantity of the reactants are required to make the desired product.

Which of the following does not depend on stoichiometry of reaction?

The stoichiometry of a chemical reaction does not depend upon the rate of the reaction. This is because the reaction rate is only dependent on the reactant concentration. While stoichiometry involves the concentration of products as well.

How do you know what the limiting reactant is?

In a stoichiometric reaction, the reactant that is consumed first to complete the product formation is the limiting reactant. You can fastly identify the limiting reactant in a balanced chemical reaction with the assistance of another limiting reactant calculator.

How does stoichiometry support the law of conservation of mass?

In stoichiometry, the reactant and product quantity remains the same for always. It is the corresponding definition of mass conservation law which states that:

“Mass is neither be created nor destroyed”

What is stoichiometry of solid?

The particular ratio of the cations and the anions in the chemical reaction of solids is called the stoichiometry of solids.


The concept of stoichiometry is highly important in the field of science and technology. Specially when it comes to drug synthesis, the stoichiometry is very noticeable as it assists the chemists to maintain a reliable drug ratio to treat patients with different medicinal uses. Apart from this, you can find its applications in rocket propulsion, green chemistry and many other related physical phenomena. This is why we have developed this free gas stoichiometry calculators so that you may understand the concept behind this chemistry better.


From the source of Wikipedia: Stoichiometry, Etymology, Converting grams to moles, Molar proportion, Determining amount of product, Stoichiometric ratio, Limiting reagent and percent yield, Stoichiometry matrix

From the source of Khan Academy: Balancing chemical equations, Calculating amounts of reactants and products, Ideal stoichiometry

From the source of Lumen Learning: Reaction Stoichiometry, Moles to Moles, Grams to Moles