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WorksheetsStoichiometry and Percent Yield
Total questions: 15
Worksheet time: 15mins
Your percent yield is 80%. The actual amount of product produced was 29.1 grams. What is the theoretical yield?
25.2 grams
37.3 grams
37.1 grams
36.3 grams
In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?
82%
0.82%
10.1 %
100%
What is a limiting reagent?
any reactant used up first in a reaction.
any reactant left over at the end of a reaction.
the maximum amount of product formed from a given amount of reactant.
the purity of the reactant.
Which reactant is the limiting reagent and why?
2H2(g) + O2(g) → 2H2O(l)
Hydrogen is the limiting reagent because two moles of hydrogen is required for every one mole of oxygen to produce two water.
Oxygen is the limiting reagent because two moles of hydrogen is required for every one mole of oxygen to produce two water.
FeBr2 + 2 KCl → FeCl2 + 2 KBr
b) What is my percent yield of iron (II) chloride if I started with 34 grams of iron(II) bromide and my actual yield is 4 grams?
20%
28%
13%
17%
If 5.2 grams of Mn(SO4)2 are actually formed in the lab, what is the percent yield?
The calculated number of grams for Mn(SO4)2 is 6.30 grams
37%
48%
53%
83%
If 10.5g of Na3N is decomposed, calculate the theoretical mass of sodium that should be produced. If only 2.84g of sodium is actually collected, what is the percent yield?
2Na3N → 6Na + N2
77%
65%
33%
54%
In the balanced reaction below, 9.8 g of benzene, C6H6, reacts with excess HNO3 resulting in 1.0 g of H2O. What is the percentage yield?
Molar mass (g/mol): C6H6 = 78 HNO3= 63 C6H5NO2= 123 H2O = 18
C6H6 + HNO3 → C6H5NO2 + H2O
22%
44%
12%
85%
CH4 + 2O2 → CO2 + 2H2O
24 grams of CH4 was added to the above reaction. Calculate the theoretical yield of CO2.
66 grams
132 grams
33 grams
8.72
When reacting Na with Cl2, we calculated that the theoretical yield should be 12.5 grams. Our actual yield was 13.0 grams. What is the percent yield?
100%
104%
96%
1.04
The reaction of 25.0 g benzene, C6H6, with excess HNO3 resulted in 21.4 g C6H5NO2. What is the percentage yield?
C6H6 + HNO3 → C6H5NO2 + H2O
100%
27.39%
54.29%
85.62%
Lead nitrate can be decomposed by heating. What is the % yield of the decomposition reaction if 7.4g Pb(NO3)2 are heated to give 4.1 g PbO?
2Pb(NO3)2 (s)→2PbO(s)+4NO2(g)+O2(g)
82%
44%
56%
67%
A chemical reaction has a theoretical yield of 50 grams. If the actual yield is 40 grams, what is the percent yield?
80%
75%
85%
90%
In the reaction @@ ext{2H}_2 + ext{O}_2 ightarrow ext{2H}_2 ext{O} ,ifyoustartwith10gramsof ext{H}_2 andexcess ext{O}_2 ,whatisthetheoreticalyieldofwater?(Molarmassof ext{H}_2 = 2 ext{g/mol} and ext{H}_2 ext{O} = 18 ext{g/mol}@@)
90 grams
80 grams
45 grams
36 grams
A student performs a reaction and obtains a percent yield of 92%. If the theoretical yield was 25 grams, what was the actual yield?
23 grams
22 grams
24 grams
21 grams
