Chapter 11, Problem 67E

In the following digram, the white spheres represent hydrogen atom, the black spheres carbon atoms, and the red spheres oxygen atoms.

In this reaction, there are two reactants, ethylene, C₂H₄, which is shown, and oxygen, O₂, which is not shown, and two products, CO₂ and H₂O, both of which are shown.

1. Write a balanced chemical equation for the reaction.
2. Determine the number of O₂ molecules that should be shown in the left (reactants) box.