stoichiometry

Introduction to stoichiometry

The word ‘stoichiometry’ is derived from two

Greek words - stoicheion (meaning element)

and metron (meaning measure).

Stoichiometry is the study of numerical relationship between the amounts of reactants used and amounts of products formed by a chemical reaction. Stoichiometry is based on the law of conservation of mass and the mass of reactants equals the mass of the products.

Why do we use this?

Stoichiometry problems consist of predicting the amount of gram of product that will form from a reaction.if you know how many grams of reactants you have predicting the number of gram of reactant that will be needed to produce a certain amount of product.

How can stoichiometry be used in real life?

Let's we start this, stiochiometry can be used in cooking. We going start baking a butter cake, for baking a butter cake needed some ingredient like flour,butter,suger,eggs for bake a nice and tasty butter cake. all this ingredient required in specific proportions without this ingredient cake will collapsed.
So, see below the proportions of ingredients for baking tasty butter cake.
Flour (200gm)+butter (250gm)+sugar (200gm)+4eggs= 1 cake 🍰


What is stiochiometry to your understanding?

The formula or equation used for cake baking describe relationship between each ingredient and product,so that we can use it to determine the amount of ingredients we need to prepare or the amount of the product we can get.

If we want to be bake 4 butter cake,how much proportions of ingredients required.lets see that

For 1 butter cake,
Flour (200gm)+butter (250gm)+sugar (200gm)+4eggs

For 4 butter cake,
For understanding,1) one portion of flour, butter 
                                        & sugar = 100 gm
                                   2) one portion of egg = 4
                                   3) one whole cake = 1
Flour         + Butter    +  Sugar    + egg = 1cake
(200gm)      (250gm)    (200gm)      4    = 1

  ( 2 )   :        ( 2.5  )    :     (2)          :   ( 1 )   = (1)
 (2×4)  :      (2.5×4)    :   (2×4)        :  (1×4)  = (1×4)              8    :         10         :        8          :      4    =  4  
(8×100gm):(10×100gm):(8×100gm):(4×4)=4

Flour     : butter     : Sugar    :eggs  = 4 cake
(800gm): (1000gm): (800gm):16     = 4 cake

Can you see how important a recipe, formula or equation is when we are cooking especially baking a cake.this recipe give us the information about the relative amounts of the ingredients.which are flour, butter, sugar and eggs and the product which is cake in this case.according to this recipe,we know the amount of each ingredient we have or how much we need to prepare for each ingredient.also if we know how many cakes we are going to make.

How does this look using Chemistry?

All stoichiometry calculations begin with balanced chemical equation.
4Fe + 3O2  = 2 Fe2O3

We then go through steps to calculate,how much product can be made with a certain amount of reactants.