Question

how to balance a eqn

Answer 1

Hi friend,

There are many ways to balance a equation for example the trial and error method, I think it is the best. All you have to do is to see that all of the elements on both sides of equal sign are equal.
For example:-
PCL3+H2O------>H3PO3+HCL
P=1(left),1(right)
CL=3(left), 1(right)
H=2(left),4(right)
O=1(left), 3(right)
Now after counting we have to try to balance in both sides
There are 2 hydrogen atoms in left to make it equall we multiply it by 3 to get 6 hydrogen atoms on both sides as there are only 3 atoms on right we multiply the HCl with 3 and add it to H3 thus the equation satisfies. And we get the equation as PCL3 +3H2O = H3PO3+3HCL

HOPE I HELPED YOU

Answer 2

Let's consider a simple chemical equation to balance.

H₂ + O₂ -------> H₂O

Now first thing to do is compare the number of atoms of each element on reactants and products side.
Let's first do it for oxygen.
On reactants side there are 2 atoms of hydrogen.On products side there is only 1.

So we have to write 2 near the products side
H₂ +  O₂ -------> 2H₂O -----[i]
Now see, two atoms of oxygen on products and reactants side, so oxygen is balanced.

Now let's do it for hydrogen.
In the above equation,
On reactants side, there are 2 atoms of hydrogen but on products side there are 2 x 2 = 4 atoms of hydrogen
In order to make equal we need to write '2' co-efficient on the reactants side of hydrogen.Now the equation is

2H₂ +  O₂ ------> 2H₂O

Now there are 4 atoms of hydrogen on both reactants and products side

So the equation is balanced.

Like this you can balance any equation

Hope This Helps You