Question

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? A. 0.86 percent B. 1.15 percent C. 87 percent D. 67 percent

Answer 1

formula for percent yield is
%yield= (got/theoretical) * 100

theoretically, the student was supposed to get 9g of product
but actually got 7.8g

7.8/9 = 0.866 *100 = 86.6%
2 sig fig makes it 87%

your answer should be
C) 87%