Which of the following is a measure of the efficiency of a chemical reaction?

actual yield

theoretical yield

annual yield

percent yield


2. Rasheed calculates that his chemical reaction should produce 4 moles of product, but when he does the experiment, he gets only 3 moles. What is his percent yield?
12%

43%

75%

133%


3. If you want to find the actual amount of reactants that are needed to get a desired amount of product, you have to know which of the following?
unbalanced equation for that reaction

percent yield

excess reactant

heat the reaction generates


4. For the reaction NH4NO3 (s) N2O (g) +2H2O (l), you decompose 60 g of NH4NO3 and get 11 g of N2O. What is the percent yield?

33%

65%

25%

90%


5. The reaction 2HgO (s) 2Hg (l) + O2 (g) has a percent yield of 50%. You want to produce 100 g of Hg. How much HgO do you need?

54 g

108 g

216 g

432 g