According to law of mass conservation , mass can not create and can't destroyed , in chemical Reaction , total mass of elements is equal to total mass of product ,
We can say that , chemical Reaction follow mass conservation law.
We can say that , chemical Reaction follow mass conservation law.
In other words , the number of atoms in each elements is remains same before the reaction and after the reaction. hence , we need to balance a skeletal chemical Reaction.
For example , the word Equation is ----
Zinc + sulphuric acid→zincsulphate +hydrogen
The above word reaction may be represent following chemical -
The above word reaction may be represent following chemical -
Zn + H2so4 → Znso4 + H2
Let us examine the number of atoms in following chemical Equation.
Number of atoms of each elements same both side in Equation. So this equation is balanced .
Now , we will discuss in step by steps about How to do balance Chemical reaction ?.
Let us try to balance following chemical equation.
STEP 1 :- first we will observe the equation and will draw the box like this ..
STEP 2 :- after this , we select an element , which number of atoms are maximum. In this equation oxygen is maximum atoms contains. Using this criteria we select oxygen from product . It may be from reactant or product.
There are four oxygen atoms in product (RHS)
To balanced the equation atoms-
After this process the equation is partially balanced .
Fe + 4 H2O → Fe3O4 + H2
STEP 3 :- Fe and hydrogen atoms are still not balanced. To equalise the number of H atoms, make the number of molecules of hydrogen as four on the RHS.
Fe + 4 H2O → Fe3O4 + 4 H2
STEP4 :- Examine the above equation and pick up the third element which is not balanced. You find that only one element is left to be balanced, that is, iron.
3 Fe + 4 H2O → Fe3O4 + 4 H2
STEP 5 :- Finally, to check the correctness of the balanced equation, we count atoms of each element on both sides of the equation.
3 Fe + 4 H2O → Fe3O4 + 4 H2
The numbers of atoms of elements on both sides of Eq. are equal. This equation is now balanced. This method of balancing chemical
equations is called hit-and-trial method.
Now , we will discuss in step by steps about How to do balance Chemical reaction ?.
Let us try to balance following chemical equation.
Fe + H2O → Fe3O4 + H2
STEP 1 :- first we will observe the equation and will draw the box like this ..
STEP 2 :- after this , we select an element , which number of atoms are maximum. In this equation oxygen is maximum atoms contains. Using this criteria we select oxygen from product . It may be from reactant or product.
There are four oxygen atoms in product (RHS)
To balanced the equation atoms-
After this process the equation is partially balanced .
Fe + 4 H2O → Fe3O4 + H2
STEP 3 :- Fe and hydrogen atoms are still not balanced. To equalise the number of H atoms, make the number of molecules of hydrogen as four on the RHS.
Fe + 4 H2O → Fe3O4 + 4 H2
STEP
3 Fe + 4 H2O → Fe3O4 + 4 H2
STEP 5 :- Finally, to check the correctness of the balanced equation, we count atoms of each element on both sides of the equation.
3 Fe + 4 H2O → Fe3O4 + 4 H2
The numbers of atoms of elements on both sides of Eq. are equal. This equation is now balanced. This method of balancing chemical
equations is called hit-and-trial method.
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