What is the balanced equation for the combustion of Ethanol C2H8O ???

C2H6O+3O2→2CO2(g)+3H2O

Explanation:

Combustion of Ethanol is reaction in which ethanol reacts with oxygen to release carbon dioxide and water molecule.

1. C2H6O+O2→CO2(g)+H2O

Given is the chemical equation of combustion of ethanol but it is not balanced .

To balance it

lets balance carbon first  

Since there are two carbon atoms on LHS, to balance it on RHS we add 2 as coefficient on C02 in RHS.

Then we have equation

2. C2H6O+O2→2CO2(g)+H2O

lets balance hydrogen now  

Since there are six hydrogen atoms on LHS, to balance it on RHS we add 3 as coefficient on H20 in RHS. On RHS there are two hydrogen atoms. When   3 is added as coefficient then number of hydrogen atoms becomes 6 (3*2 = 6)

Then we have equation given below

2. C2H6O+O2→2CO2(g)+3H2O

lets balance oxygen now now  

on RHS

no. of atoms of oxygen on RHS in 2CO2 = 2*2 = 4

no. of atoms of oxygen on RHS in 3H2O = 3*1 = 3

Total no. of atoms of oxygen on RHS = 4+3 = 7

no. of atoms of oxygen on LHS in C2H6O = 1*1 = 1

no. of atoms of oxygen on LHS in O2 = 1*2 = 2

Total no. of atoms of oxygen on LHS = 2+1 = 3

We cannot make changes in C2H6O as atoms of carbon and hydrogen are balanced so we have to balance the atoms of O2 on RHS.

We add coefficient 3 to O2 on LHS which makes no of atoms in O2 to be 6 (3*2 = 6)

Thus total atoms of oxygen on RHS becomes 7( one atom of oxygen in  C2H6O and 6 atoms in O2)

Writing it we have equation given below.

C2H6O+3O2→2CO2(g)+3H2O

This is the solution to the problem.

Answer-  

C2H5OH + 3O2 → 2CO2 + 3H2O

Solution -  

When ethanol burns in air , it reacts with oxygen to produce carbon dioxide and water as by product

The reaction would be  

Ethanol + Air (O2) > Carbon dioxide + water

We will write the half reaction equation  

First Half reaction equation would be –  

C2 > 2C+2 + 4 e-

O2 + 4e- > 2O2

Adding the above two half reactions we get  

C2H5OH + O2 + 4e-  > CO2 + 4e- + H2O

The balanced equation is  

C2H5OH + 3O2 → 2CO2 + 3H2O

the answer to this question is 3.

i do not get it   at all