Theoretically, a student performing a lab experiment was expected to get 9 g of product. instead, the student obtained only 7.8 g. what is the percent yield of the reaction performed by the student?

We are given with a theoretical amount of 9 grams of product but the student only got 7.8 grams. To calculate the percent yield, we divide the experimental amount by the theoretical amount. In this case, we divide 7.8 grams by 9 grams and multiply by 100 percent. The answer is equal to 86.67 percent.

They can measure  the amount of energy gained or lost