A chemist interested in the efficiency of a chemical reaction would calculate the percent yield.

Here's why:

* Percent yield is a measure of how much of the desired product is actually obtained compared to the theoretical maximum amount that could be produced based on the stoichiometry of the reaction.

Here's the formula for calculating percent yield:

```

Percent Yield = (Actual Yield / Theoretical Yield) x 100%

```

* Actual yield is the amount of product actually obtained from the reaction.

* Theoretical yield is the maximum amount of product that could be produced based on the limiting reactant.

A higher percent yield indicates a more efficient reaction.

Let me know if you'd like to explore other concepts related to chemical reaction efficiency!