Page 1295 - Chemistry--atom first

Answer Key 1285
43. Yes, fluorine is a smaller atom than Li, so atoms in the 2s orbital are closer to the nucleus and more stable. 45. 2+
47. N2 has s-p mixing, so the π orbitals are the last filled in O2 does not have s-p mixing, so the σp orbital fills before the π orbitals.
Chapter 6
1. (a) 12.01 amu; (b) 12.01 amu; (c) 144.12 amu; (d) 60.05 amu
3. (a) 123.896 amu; (b) 18.015 amu; (c) 164.086 amu; (d) 60.052 amu; (e) 342.297 amu
5. (a) 56.107 amu; (b) 54.091 amu; (c) 199.9976 amu; (d) 97.9950 amu
8. (a) % N = 82.24% % H = 17.76%;
(b) % Na = 29.08% % S = 40.56%
% O = 30.36%;
(c) % Ca2+ = 38.76%
10. % NH3 = 38.2% 12. (a) CS2
(b) CH2O
14. C6H6
16. Mg3Si2H3O8 (empirical formula), Mg6Si4H6O16 (molecular formula)
18. C15H15N3
20. We need to know the number of moles of sulfuric acid dissolved in the solution and the volume of the solution.
22. (a) 0.679 M; (b) 1.00 M;
(c) 0.06998 M; (d) 1.75 M;
(e) 0.070 M; (f) 6.6 M
24. (a) determine the number of moles of glucose in 0.500 L of solution; determine the molar mass of glucose; determine the mass of glucose from the number of moles and its molar mass; (b) 27 g
26. (a) 37.0 mol H2SO4; 3.63 103 g H2SO4;
(b) 3.8 10−6 mol NaCN; 1.9 10−4 g NaCN;
(c) 73.2 mol H2CO;
2.20 kg H2CO;
(d) 5.9 10−7 mol FeSO4; 8.9 10−5 g FeSO4
28. (a) Determine the molar mass of KMnO4; determine the number of moles of KMnO4 in the solution; from the number of moles and the volume of solution, determine the molarity; (b) 1.15 10−3 M
30. (a) 5.04 10−3 M; (b) 0.499 M;
(c) 9.92 M;
(d) 1.1 10−3 M
32. 0.025 M