C2H2 + O2 - CO2 + H20

What coefficients are required to correctly balance

The answer to your question is 2, 5, 4, 2

Explanation:

Data

Unbalanced chemical reaction

C₂H₂ + O₂ ⇒ CO₂ + H₂O

Reactants Elements Products

2 Carbon 1

2 Hydrogen 2

2 Oxygen 3

Balanced chemical reaction

2C₂H₂ + 5O₂ ⇒ 4CO₂ + 2H₂O

Reactants Elements Products

4 Carbon 4

4 Hydrogen 4

10 Oxygen 10

The coefficients of the balanced equations are 2, 5, 4, 2