The illustration on the left represents a mixture of H2 (light blue) molecules and O2 (red) molecules. If these were to react to form H2O molecules, what is the maximum number of H2O molecules that could form? Hint: Atoms must be conserved in an ordinary chemical reaction.

6 molecules of H2O are the maximum number.

Explanation:

From the drawing it can be seen that there are 6 H2 molecules and 3 O2 molecules reacting, which can be represented by the following chemical equation

6 H2 + 3 O2 ⇒ H2O

This equation is not balanced, so we proceed to balance it, being as follows:

6 H2 + 3 O2 ⇒ 6H2O

With which it can be determined that a maximum of 6 H2O molecules can be formed.

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