Question

question 3 of 10
points possible: 1.00
a student starts with 1.00 g of aluminum foil and calculates that the theoretical yield of alum is 17.5 g. after completing the synthesis,
they collect and dry their crystals, which have a mass of 15.0 g. what is the students percent yield?
select one:
15.0%
117%
6.7%
85.7%

Explanation:

Step1: Recall the formula for percent yield

Percent yield = $\frac{\text{actual yield}}{\text{theoretical yield}}\times100\%$

Step2: Identify the actual and theoretical yields

The actual yield is $15.0$ g (mass of crystals collected), and the theoretical yield is $17.5$ g.

Step3: Substitute values into the formula

Percent yield = $\frac{15.0}{17.5}\times100\%$
Calculate $\frac{15.0}{17.5}=\frac{150}{175}=\frac{6}{7}\approx0.857$
Then $0.857\times100\% = 85.7\%$

Answer:

85.7%