Question

Write and balance the equation for the complete combustion of acetylene, C2H2. Phase symbols and energy changes are optional.

Answer 1

Answer:

2C2H2 + 5O2 —> 4CO2 + 2H2O

Explanation:

When acetylene, C2H2 under goes combustion, carbon (iv) oxide and water, H2O are produced according to the equation given below:

C2H2 + O2 —> CO2 + H2O

Thus, we shall balance the equation as follow:

C2H2 + O2 —> CO2 + H2O

There are 2 atoms of C on the left side and 1 atom on the right side. It can be balance by putting 2 in front of CO2 as shown below:

C2H2 + O2 —> 2CO2 + H2O

There are 2 atoms of O on the left side and a total of 5 atoms on the right side. It can be balance by putting 5/2 in front of O2 as shown below:

C2H2 + 5/2O2 —> 2CO2 + H2O

Multiply through by 2 to clear the fraction

2C2H2 + 5O2 —> 4CO2 + 2H2O

Thus, the equation is balanced.