percent yield

Multiple Choice

What is the formula for percent yield?

• $$\frac{Actual}{Theoretical}\times100$$

• $$\frac{Theoretical}{Actual}\times100$$

• $$\frac{Actual\times Theoretical}{100}$$

• $$\frac{100}{Actual\times Theoretical}$$

Multiple Choice

What contributes to a percent yield that is less than 100 %?

• unwanted side reaction

• incomplete reaction

• spills during the experiment

• all of these

Multiple Choice

When reacting Na with Cl₂, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?

• 90.4%

• 104%

• 96.15%

• 1.04%

Multiple Choice

P₄ + 6Cl₂ --> 4PCl₃ 
The reaction of 75.0g P₄ with excess chlorine gas produces 110g PCl₃ in lab. Find the theoretical yield and calculate percent yield for the reaction. 

• 78%

• 64%

• 27%

• 33%

Multiple Choice

The reaction of iron metal with oxygen gas produces solid Fe₂O₃:

4 Fe(s)+ 3 O₂(g) → 2 Fe₂O₃(s)

When 1.49 moles of iron metal reacts with 1.22 moles of oxygen gas, a total of 0.614 moles of product is formed. What is the percent yield? (Atomic Wt.: Fe = 55.85 g/mol; O = 16.00 g/mol)

•  82%

•  77%

• 121%

•  67%