When conducting an experiment in the lab, a student was able to actually recover 31.3 grams of Zinc Chloride. Using the balanced chemical equation (2NaHCO3 → Na2CO3 + CO2 + H2O) the student predicted that they theoretically should have been able to make 49.1 grams of Zinc Chloride.

What was the percent yield of this reaction?

The relation between number of half-lives and the amount of sample that remained is expressed as: (1/2)^n = x So, given is 7. To find x, we will change the equation with 7: (1/2)^n = x (1/2)^7 = x 0.5^7 = x 0.0078125 = x 0.0078125 x 100% = x x = 0.78125 Therefore, 0.78 % of a radioactive species would be created as daughter material after seven half-lives.