2C2H6 + 7O2 → 4CO2 + 6H2O

Question

i need help to get to this answer

Answer 1

C₂H₆ + O₂ → CO₂ + H₂O

This equation shows the combustion of ethane in the presence of oxygen gas to form carbon dioxide and water. To balance, start with the Carbons (C). There are 2 Carbons on the left and only 1 Carbon on the right side of the reaction. Insert the coefficient "2" in front of the CO₂ in order to balance the Carbons:

C₂H₆ + O₂ → 2CO₂ + H₂O

Now, examine the Hydrogens (H). There are 6 Hydrogens on the left and only 2 Hydrogen on the right side of the reaction. Insert the coefficient "3" in front of the H₂O in order to balance the Hydrogens:

C₂H₆ + O₂ → 2CO₂ + 3H₂O

Finally, count the Oxygens (O). There are 2 Oxygens on the left and 7 Oxygen on the right side of the reaction (4 Oxygen in 2CO₂ and 3 Oxygen in 3H₂O). In order to balance the Oxygens, we would need a coefficient of "3.5" or "7/2" in front of the O₂, but that is not a whole number, so double ALL of your coefficients to get the final answer.

C₂H₆ + 3.5O₂ → 2CO₂ + 3H₂O

2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O