1. Stoichiometry Unit Review

2. How many grams are equal to 1.50 moles of krypton?4
.0179
41.9
83.8
126
9.03 x 1023 1 2 3 4 5 6 7 8 9 10 11 12 13

3. How many moles of cobalt are equal to 4.7 x 1023 atoms of cobalt?
.080
.78
1.3 46
2.8 x 1025 1 2 3 4 5 6 7 8 9 10 11 12 13

4. How many moles of zirconium are equal to 270 grams of zirconium?
2.96
4.49
91.2
24,629
1.78 x 1024 1 2 3 4 5 6 7 8 9 10 11 12 13

5. 243.52 grams of antimony is equal to _______ mole(s) of antimony or _______ atom(s) of antimony.
1; 6.02 x 1023
2; 6.02 x 1023
2; 1.20 x 1024
.5; 1.20 x 1024
2; 2 1 2 3 4 5 6 7 8 9 10 11 12 13

6. What is the molar mass of sulfuric acid, H2SO4?13 25 49 67 98
194 1 2 3 4 5 6 7 8 9 10 11 12 13

7. Sodium sulfide and cadmium(II) nitrate undergo a double replacement reaction. What is the mass of cadmium sulfide that can be produced from 5.00 g of sodium sulfide? Na2S + Cd(NO3)2  2 NaNO3 + CdS
0.34 g
0.64 g
4.69 g
9.38 g
18.8 g 1 2 3 4 5 6 7 8 9 10 11 12 13

8. Hydrogen and nitrogen gases can be combined to form ammonia gas, NH3
Hydrogen and nitrogen gases can be combined to form ammonia gas, NH3. How many moles of N2 are required to form 27.0 g of ammonia? 3 H2 + N2  2 NH3
0.79 mol
1.59 mol
3.17 mol
44.4 mol
88.8 mol 1 2 3 4 5 6 7 8 9 10 11 12 13

9. How many grams of the excess reactant will remain when 10
How many grams of the excess reactant will remain when 10.0 g of silicon and 100 g of oxygen react? Si + O2 → SiO2
0.0 g
21.5 g
64.8 g
88.4 g
166 g 1 2 3 4 5 6 7 8 9 10 11 12 13

10. What is the percent yield if 35 grams of SO3 is produced from 50 grams of SO2? 2SO2 + O2 → 2SO3
15%
30%
56%
80%
94% 30 1 2 3 4 5 6 7 8 9 10 11 12 13

11. Determine the percent yield of hydrogen if 12
Determine the percent yield of hydrogen if 12.5 grams of hydrogen is collected from the reaction of 500 g of zinc with 500 g of HCl. Zn(s) + 2HCl(aq) ↔ H2(g) + ZnCl2(aq)
14%
46%
77%
91%
110% 30 1 2 3 4 5 6 7 8 9 10 11 12 13

12. Participant Scores 33 Alex Huiras Emily Szczepanski Mackenzie Sinnen
Liz Theis
Shawna Plier