Untitled - Kelly Walsh High School

46 CHEMISTRY FOR THE UTTERLY CONFUSED
ANSWER KEY
1. reactants 2. Law of Conservation of Mass
3. Avogadro’s number, 6.022 1023 4. molar mass 5. 28 g/mol
6. Limiting reagent (reactant) 7. theoretical yield
8. empirical formula
9. a. 2 N2(g) 5 O2(g) l 2 N2O5(s) b. 2 CoCl2(s) 2 ClF3(g) l 2 CoF3(s) 3 Cl2(g) c. 2 La(OH) 3(s) 3 H2C2O4(aq) l La2(C2O4) 3(s) 6 H2O(l) d. 2 C4H10(g) 13 O2(g) l 8 CO2(g) 10 H2O(g) e. 2 NH3(g) 3 F2(g) l N2(g) 6 HF(g)
10. a. 2 Br2(l) 3 O2(g) l 2 Br2O3(s) b. PF3(l) 3 H2O(l) l H3PO3(aq) 3 HF(aq)
c. 3 Zn(OH) 2(s) 2 H3VO4(aq) l Zn3(VO4) 2(s) 6 H2O(l) d. 2 C6H14(l) 19 O2(g) l 12 CO2(g) 14 H2O(l) e. CH4(g) 4 Cl2(g) l CCl4(l) 4 HCl(g)
11. a. HO b. CH2O c. CH3d. HNO3 e. (NH4)SO4 12. a. 2 (H) 1 (O) 2 (1.01 g/mol) 1 (16.00 g/mol) 18.02 g/mol
b. 44.01 g/mol c. 63.11 g/mol d. 142.05 g/mol e. 149.12 g/mol
13. a. 5.549 mol H2O b. 2.272 mol CO2 c. 1.584 mol HNO3 d. 0.70398 mol Na2SO4 e. 0.67060 mol (NH4) 3PO4 14. a. 45.0 g mol H2O b. 110 g CO2 c. 158 g HNO3 d. 355 g Na2SO4 e. 0.373 g (NH4) 3PO4 15. a. (2.50 mol H2O)a 1.20 mol N2O5 b. 2.00 mol CoF3 c. 1.00 mol La2(C2O4) 3 d. 1.85 mol CO2 e. 1.00 mol N2 18.02 g H2O 1 mol H2O b
(2.50 mol H2O)Q 18.02 g H2O 1 mol H2O R
(100.00 g H2O)a 1 mol H2O 18.02 g H2O b
16. a. We have 3.00 mol Br 2/2 1.50 and 3.00 mol O 2/3 1.00, thus the O 2 is
limiting. b. H 2O c. Zn(OH) 2 d. O 2 e. Cl 2