Question

A student isolated 25 g of a compound following a procedure that would theoretically yield 81 g. What was his percent yield?

a) 30.9%
b) 53.7%
c) 61.7%
d) 78.0%

Answer 1

The percent yield of a chemical reaction is calculated using the actual yield and theoretical yield. For the student's reaction with an actual yield of 25 grams and a theoretical yield of 81 grams, the percent yield is 30.9%.

Step-by-step explanation:

The percent yield of a reaction measures the efficiency of a reaction and is calculated using the following formula:

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

In this case, the actual yield is 25 grams, and the theoretical yield is 81 grams. To calculate the percent yield, we apply the numbers to the formula:

Percent Yield = (25 / 81) × 100% = 30.8642%

After rounding to the nearest tenth, the percent yield is 30.9%, so the correct answer would be (a) 30.9%.