How to do Stoichiometry calculations in basic concepts of Chemistry

Stoichiometry calculations gives the relationship between reactants and products. Here, we will discuss about the calculations in terms of moles, masses and volumes.

What is Stoichiometry coefficients

The coefficients of the balanced chemical equation is called stoichiometric coefficients. For example :

CaCO3 + 2HCl ➡️ CaCl2 + H2O + CO2

1 mole 2 moles 1 mole 1 mole 1 mole Mole-Mole relationship

40+12+3X16 2 x (1 X 35.5) 40+2X35.5 2X1+16 12+2X16

=100g =73g = 111g =18g =44g Mass-Mass relationship

The information helps in the number of different calculations as follows :

1. Mass-mass relationship in Stoichiometry calculations

It helps in calculating the relative mass of one of the reactants/products. For example in the above example, 100g of CaCO3 gives 111g of CaCl2. Use unitary method to calculate the unknown mass.

2. Volume-Volume relationship in Stoichiometry calculations

Similarly, use relative volume relationship helps to calculate the unknown volume. According to mole concept, 1 mole of gas at S.T.P. weighs 22.4 L

3. Mass-Volume relationship in Stoichiometry calculations

Let’s see the example explained above. 1 mole of CaCO3 gives 1 mole of CO2 in the balanced chemical equation. In terms of Mass-Volume relationship 100g of CaCO3 gives 22.4L of CO2 gas at S.T.P.

One more example is given below:

http://Stoichiometry calculations in basic concepts of Chemistry

FAQ’s related

  1. How is stoichiometry used in real life ?

Answer : The production of different substances uses stoichiometry. It helps to determine the proper ratio of ingredients.

2. What is stoichiometry formula ?

Answer : It helps in the knowing the relative amounts of reactants and products.

3. What is R in stoichiometry ?

Answer : R is the universal gas constant called the universal constant. Value of R = 0.082 L.atm/K.mol

4. Which industries use stoichiometry calculations ?

Answer : Pharmaceuticals, environmental science, industrial manufacturing and many more use these calculations.

Check out the structure of NH3 here

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