أسئلة اختيار من متعدد باللغة الإنجليزية للوحدة الثالثة chapter 3 Stoichiometry: Calculations with Chemical Formulas and Equations من كتاب CHEMISTRY THE CENTRAL SCIENCE
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أسئلة اختيار من متعدد باللغة الإنجليزية للوحدة الثالثة Stoichiometry: Calculations with Chemical Formulas and Equations من كتاب CHEMISTRY THE CENTRAL SCIENCE
هذه الأسئلة أيضا تغطي :
- الوحدة الثالثة: Mass Relationships in Chemical Reactions من كتاب Chemistry 13th edition by: Raymond Chang and Jason Overby
- الوحدة الثالثة: Stoichiometry من كتاب Chemistry 9th edition by: Zumdhal
(باللون الأحمر هي الإجابة الصحيحة)
1. How many oxygen atoms are contained in 2.74 g of Al2(SO4)3?
a) 12 b) 6.02 x 1023 c) 7.22 x 1024 d) 5.79 x 1022
2. The total number of atoms in 0.111 mol of Fe(CO)3(PH3)2 is:
a) 15 b) 1.00 x 1024 c) 4.46 x 1021 d) 1.67 e) 2.76 x 10-24
3. 2.1043 moles of which one of the following has the largest number of atoms?
a) S8 b) C10H8 c) Al2(SO4)3 d) Na3PO4
4. How many moles of carbon atoms are contained in 4 moles of dimethylsulfoxide, C2H6SO?
a) 2 b) 6 c) 8 d) 4
5. One million argon atoms is how many moles of argon atoms?
a) 3 b) 1.7 x 10-18 c) 6.0 x 1023 d) 1.0 x 10-6
6. How many sulfur atoms are there in 25 molecules of C4H4S2?
a) 1.5 X 1025 b) 4.8 X 1025 c) 3.0 X 1025 d) 50
7. How many molecules of CH4 are in 48.2 g of this compound?
a) 5.00 X 10-24 b) 3.00 c) 2.90 X 1025 d) 1.81 X 1024
8. How many grams of hydrogen are in 46 g of CH4O?
a) 5.8 b) 1.5 c) 2.8 d) 0.36
9. How many molecules of CH4O are in 32.0 g of CH4O?
a) 5.32 X 10-23 b) 1.00 c) 1.88 X 1022 d) 6.00 X 1023
10. How many atoms of nitrogen are in 10. g of NH4NO3?
a) 3.5 b) 1.5 X 1023 c) 3.0 X 1023 d) 1.8
11. Argon gas has a density of 1.40 g/L at standard conditions. How many argon atoms are in 1.0 L of argon gas?
a) 4.7 X 1022 b) 3.4 X 1025 c) 2.1 X 1022 d) 1.5 X 1025
12. What mass of magnesium nitride can be made from reaction of 1.22 g of magnesium with excess nitrogen?
3Mg + N2 → Mg3N2
a) 1.69 g b) 15.2 g c) 5.07 g d) 5.02 g
13. How many grams of oxygen are required to burn 28.8 g of ammonia?
4NH3 + 7O2 → 4NO2 + 6H2O
a) 94.9 g b) 54.1 g c) 108 g d) 15.3 g
14. How many grams of H2O are formed by complete conversion of 32.00 g O2 with excess H2 according to: 2H2 + O2 → 2H2O
a) 18.02 b) 36.03 c) 32.00 d) 2.016 e) 4.032
15. How many moles of GeF4 are needed to form 8.00 mol GeF3H according to the reaction: GeH4 + 3GeF4 → 4GeF3H if the product is obtained in 92.6% yield?
a) 1.85 b) 2.00 c) 6.5 d) 7.41 e) 2.16
16. How many moles of CO2 are produced when 2.5 moles of O2 react according to the following equation?
C3H8 + 5O2 → 3CO2 + 4H2O
a) 1.5 b) 3 c) 5 d) 6
17. Consider the equation shown below. If 3.0 g of O2 produces 3.4 g of H2O, how many grams of H2O would be produced by 6.0 g of O2?
2H2 + O2 → 2H2O
a) 3.4 b) 6.8 c) 1.7 d) 6.4
18. How many grams of N2 will be required to completely react with 9.3 g of H2 according to the following equation?
N2 + 3H2 → 2NH3
a) 1.3 X 102 b) 2.0 c) 43 d) 3.9 X 102
19. How many grams of PbI2 could be made from the complete reaction of 6.5 g of KI according to the following balanced equation?
Pb(NO3)2 + 2KI → PbI2 + 2KNO3
a) 2.3 b) 9.0 c) 18 d) 36
20. What mass of hydrogen can be produced by reaction of 4.73 g of magnesium with 1.83 g of water?
Mg + 2H2O → Mg(OH)2 + H2
a) 0.102 g b) 0.0162 g c) 0.0485 g d) 0.219 g
21. What mass of silver chloride can be made by reaction of 4.22 g of silver nitrate with 7.73 g of aluminum chloride?
3AgNO3 + AlCl3 → Al(NO3)3 + 3AgCl
a) 17.6 g b) 4.22 g c) 24.9 g d) 3.56 g
22. If the reaction of 3.82 g of magnesium nitride with 7.73 g of water produced 3.60 g of magnesium oxide, what is the percent yield of this reaction?
Mg3N2 + 3H2O → 2NH3 + 3MgO
a) 94.5% b) 78.7% c) 46.6% d) 49.4%
23. For Fe(CO)5 + 2PF3 + H2 → Fe(CO)2(PF3)2(H)2 + 3CO, how many moles of CO can from a mixture of 5.0 mol Fe(CO)5, 8.0 mol PF3, and 6.0 mol H2?
a) 15 b) 5.0 c) 24 d) 6.0 e) 12
24. For Ru3(CO)12 + 9AsF3 → 3Ru(CO)2(AsF3)3 + 6CO, how many millimoles of Ru(CO)2(AsF3)3 can form from a mixture of 2.0 mmol Ru3(CO)12 and 24 mmol AsF3?
a) 2.0 b) 6.0 c) 12 d) 54 e) 8.0
25. C2H4 burns in O2 to produce CO2 and H2O according to the following equation.
C2H4 + 3O2 → 2CO2 + 2H2O
How many grams of CO2 will be formed when 3.0 g of C2H4 reacts with 3.0 g of O2?
a) 2.8 b) 4.1 c) 6.2 d) 9.4
26. How many grams of SF6 could be produced by the reaction of 3.5 g of sulfur with 4.5 g of fluorine according to the following equation?
S + 3F2 → SF6
a) 12 b) 3.2 c) 5.8 d) 16
27. If the reaction of 2.5 g of aluminum with 2.5 g of oxygen produced 3.5 g of aluminum oxide, what is the percent yield of aluminum oxide?
4Al + 3O2 → 2Al2O3
a) 74% b) 37% c) 47% d) 66% e) 26%
28. The percent yield of sulfur hexafluoride in the reaction below is 79%. Calculate the theoretical yield of sulfur hexafluoride if 7.9 g of fluorine reacts with excess sulfur.
S + 3F2 → SF6
a) 30. g b) 10. g c) 7.9 g d) 24 g e) 0.11 g
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