PercentYield-Chemistry-ESU7：率-化学-伊苏7

Percent Yield - Chemistry
Name: ____________________________________
Percent Yield = (actual yield/theoretical yield) x 100
1. A student adds 200.0g of C7H6O3 to an excess of C4H6O3, this produces C9H8O4 and C2H4O
2. Calculate the percent yield if 231 g of aspirin (C9H8O4) is produced.
C7H6O3 + C4H6O3→ C9H8O4 + C2H4O2 1 C7H6O3 + 1 C4H6O3→ 1 C9H8O4 + 1 C2H4O2
231 g C9H8O4 x 100 =
g C9H8O4≈90%
2. According to the following equation calculate the percentage yield if 550.0 g of toluene (C7H8) added to an excess of nitric acid (HNO3) provides 305 g of the p-nitrotoluene product.
C7H8 + HNO3→ C7H7NO2 + H2O
37.2%
3. Quicklime, CaO, can be prepared by roasting limestone, CaCO3, according to the chemical equation below. When 2.00 x 103 g of CaCO3 are heated, the actual yield of CaO is 1.50 x 103 g. What is the percentage yield?
CaCO3→ CaO + CO2 1 CaCO3→ 1 CaO + 1 CO2
2000 g CaCO3 1 mol CaCO3 1 mol CaO 56.079 g CaO = 1120.594 g CaO
100.088 g CaCO3 1 mol CaCO3 1 mol CaO
Ca 1 x 40.08 = 40.08
C 1 x 12.011 = 12.011
O 3 x 15.999 = 47.997
100.088 g CaCO3
Ca 1 x 40.08 = 40.08
O 1 x 15.999 = 15.999
56.079 g CaO
1120.594 x 100 = 74.706 %
1500
4. Aluminum reacts with an aqueous solution containing excess copper (II) sulfate. If 1.85 g Al reacts and the percentage yield of Cu is 56.6%, what mass of Cu is produced?
Al + CuSO4 Cu + Al2(SO4)3
3.70g
5. The combustion of methane produces carbon dioxide and water. Assume that 2.0 mol of CH4 burned in the presence of excess air. What is the percentage yield if the reaction produces 87.0 g of CO2?
99%
6. How many atoms of chromium are in 23.2 g of Cr ore that is 73.4 % pure?
73.4 = ____ = 17.0288 g Cr
100 23.2
17.0288 g Cr 1 mol Cr 6.02 x 1023 atoms = 1.972 x 1023 atoms of Cr
51.996 g Cr 1 mol
Cr 1 x 51.996 = 51.996 g Cr
7. What is the percent yield of this reaction if 14 moles of ZnO are produced from the reaction of 256 grams of O2 with excess Zn?
Zn + O2 → ZnO
8. If the percent yield is 40%, how many atoms of O are produced from 6.02×1023 formula units of KClO3(s)? KClO3(s) → KCl(s) + O2(g)
9. At STP, 9.83×1024 formula units of KClO3(s) decompose into KCl and 82 L of O2(g). What is the percent yield?
KClO3(s) → KCl(s) + O2(g)
10. What is the percent yield of the following reaction if 60 grams of CaCO3 is heated to give 15 grams of CaO?
CaCO3→ CaO + CO2
Percent Yield #1 - Chemistry
Name: ____________________________________
Percent Yield = (actual yield/theoretical yield) x 100
1. A student adds 200.0g of C7H6O3 to an excess of C4H6O3, this produces C9H8O4 and C2H4O
2. Calculate the percent yield if 231 g of aspirin (C9H8O4) is produced.
C7H6O3 + C4H6O3→ C9H8O4 + C2H4O2
≈90%
2. According to the following equation calculate the percentage yield if 550.0 g of toluene (C7H8) added to an excess of nitric acid (HNO3) provides 305 g of the p-nitrotoluene product.
C7H8 + HNO3→ C7H7NO2 + H2O
37.2%
3. Quicklime, CaO, can be prepared by roasting limestone, CaCO3, according to the chemical equation below. When 2.00 x 103 g of CaCO3 are heated, the actual yield of CaO is 1.50 x 103 g. What is the percentage yield?
CaCO3→ CaO + CO2
93.8%
4. Aluminum reacts with an aqueous solution containing excess copper (II) sulfate. If 1.85 g Al reacts and the percentage yield of Cu is 56.6%, what mass of Cu is produced?
Al + CuSO4 Cu + Al2(SO4)3
3.70g
5. The combustion of methane produces carbon dioxide and water. Assume that 2.0 mol of CH4 burned in the presence of excess air. What is the percentage yield if the reaction produces 87.0 g of CO2?
99%
6. How many atoms of chromium are in 23.2g of Cr ore that is 73.4% pure?
7. What is the percent yield of this reaction if 14 moles of ZnO are produced from the reaction of 256 grams of O2 with excess Zn?
Zn + O2 → ZnO
8. If the percent yield is 40%, how many atoms of O are produced from 6.02×1023 formula units of KClO3(s)? KClO3(s) → KCl(s) + O2(g)
9. At STP, 9.83×1024 formula units of KClO3(s) decompose into KCl and 82 L of O2(g). What is the percent yield?
KClO3(s) → KCl(s) + O2(g)
10. What is the percent yield of the following reaction if 60 grams of CaCO3 is heated to give 15 grams of CaO?
CaCO3→ CaO + CO2。