Question

The following chemical equation shows the incomplete formula for burning methanol. The question mark represents the unknown number of oxygen (O2) molecules. How many molecules of O2 are needed to balance this chemical equation? *

1 point
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1
3
5
6

Answer 1

3

Step-by-step explanation:

You have fixed eight atoms of O on the right (four in CO₂ and four in H₂O).

You need eight atoms of O on the left. You have fixed two of them in the CH₃OH, so you must fix six of them in the O₂.

Put a 3 in front of the O₂. Then you have a balanced equation.