1. What is the coefficient for CO when the following equation is balanced with the smallest whole number coefficients? Fe2O3 + CO {image} CO2 + Fe 5 6 3 4 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

2. Balance the following equation with the smallest whole number coefficients. Choose the answer that is the sum of the coefficients in the balanced equation. Do not forget coefficients of "one". C5H6NS + O2 {image} CO2 + H2O + NO2 + SO2 33 35 37 39 41 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

3. Balance the following equation with the smallest whole number coefficients. Choose the answer that is the sum of the coefficients in the balanced equation. Do not forget coefficients of "one". Cr2(SO4)3 + RbOH {image} Cr(OH)3 + Rb2SO4 10 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

4. How many moles of CO2would be produced from 56 moles of O2 according to the following balanced equation? 2C2H6 + 7O2 {image} 4CO2 + 6H2O 16 32
224 48 8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

5. What mass of SnCl4 must react with excess FeCl2 to produce 70
What mass of SnCl4 must react with excess FeCl2 to produce 70.0 grams of SnCl2? SnCl4 + 2FeCl2 {image} SnCl2 + 2FeCl3
76.1 g
96.2 g
99.2 g
106 g
110 g 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

6. What is the maximum amount of Ca3(PO4)2 that can be prepared from 9
What is the maximum amount of Ca3(PO4)2 that can be prepared from 9.8 g of Ca(OH)2 and 9.8 g of H3PO4?3Ca(OH)2 + 2H3PO4 {image} Ca3(PO4)2+ 6H2O
6.8 g
8.6 g
10.3 g
13.7 g
15.5 g 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

7. If a reaction of 27. 5 g of Fe with 63. 1 g Cl2produced 60
If a reaction of 27.5 g of Fe with 63.1 g Cl2produced 60.4 g of FeCl3, what was the limiting reactant and the percent yield? 3Cl2+ 2Fe {image} 2FeCl3
Fe, 75.6%
Fe, 62.8%
Cl2, 41.8%
Cl2,63.0%
Fe, 37.8% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

8. If 23. 0 g of NaCl is dissolved in 300
If 23.0 g of NaCl is dissolved in 300. g of H2O, what is the percent by mass of NaCl in the resulting solution?
0.080%
0.767%
7.67%
7.12%
21.4% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

9. The density of a 34. 0% solution of NaBr is 1. 33 g/mL
The density of a 34.0% solution of NaBr is 1.33 g/mL. What volume of the solution contains 25.7 g of NaBr?
101 mL
6.57 mL
32.8 mL
105 mL
56.8 mL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

10. What mass of CaCl2 must be dissolved in enough water to produce 2000
What mass of CaCl2 must be dissolved in enough water to produce mL of 1.25 M CaCl2?
174 g
277 g
90.7 g
81.1 g
310 g 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

11. How many mL of 18. 4 M H2SO4 are needed to prepare 600. mL of 0
How many mL of 18.4 M H2SO4 are needed to prepare 600. mL of 0.10 M H2SO4?
1.8 mL
2.7 mL
3.3 mL
4.0 mL
4.6 mL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

12. What volume of 3.00 molar sulfuric acid, H2SO4, is required to react with 250. grams of calcium carbonate, CaCO3? CaCO3 + H2SO4 {image} CaSO4 + CO2+ H2O
208 mL
462 mL
767 mL
833 mL
946 mL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

13. What volume of molar nitric acid, HNO3, is required to react with 48.0 mL of M calcium hydroxide, Ca(OH)2, according to the following equation? 2HNO3 + Ca(OH)2 {image} Ca(NO3)2 + 2H2O
24.8 mL
9.62 mL
38.4 mL
19.2 mL
45.0 mL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50