444
Answers to Problems of the A Groups
(c) A//° = -36.43 kcal = -152.42 kj; A£° = -37.02 kcal
(d) A//° = -69.10 kcal = -289.11 kj; A£° = -68.81 kcal
(e) A#° = -33.09 kcal = -138.45 kj; A£° = -31.91 kcal
(f) A#° = -38.98 kcal = -163.09 kj; A£° = -39.57 kcal
13. (a) NH 3(B1 + aq -> NH 3(M)
A//° = -8.28 kcal
(b) 2Fe (s) + 30 2(0) ^ Fe 2 O 3(s)
A//° = -196.5 kcal
(c) CgHg,,, + ¥0 2(fl) -* 6C0 2(fl) + 3H 2 0, 0
A//
0 = -780.98 kcal
(d) Cd( 8 ) + 2H(^,,) —> Cdj n
+ <,) + H 2(9 )
A//° = -17.30 kcal
(e*\ '>U +
_L ^2—
«. 1_T C
^c^ z,ri^ a( |) t" O( a gj ' n.2O(g,)
A^° = -14.82 kcal
14. A//T = -80 cal/mole
AS T = -0.27 cal/mole °C
15. A# v ° = +10.12 kcal/mole
AS? = +34.0 cal/mole °C
16. (a) 123.12 kcal/bond
(b) 110.57 kcal/bond
17. (a) C 12 H 22 0 11(S) + 12 0 2(fll -> 12CO 2(fl)
A//° = -1345 kcal/mole
(b) A//? = -535.12 kcal/mole
(c) 20.45 kcal/teaspoonful
1785.47 kcal/lb
(c) 84.29 kcal/bond
(d) 63.12 kcal/bond
+ 11 H 2 Om
CHAPTER 15
1. 48.8 min
2. 0.20 cpm
3. 99.57 mg
4. 2.076 x IO
3 yr
5. (a) first order with respect to BOOP
(b) k = 3.54 x 10~
4 u~
l min-'
6. (a) Second-order reaction
(b) k = 1.44 x 10~
4 ton1 mirr
1
7. (a) Second-order reaction
(b) k = 9.12 x 10-' ton1 min'
1
8. (a) First-order reaction
(b) k = -0.0187 min1
9. (a) Approx 900 cal/mole for each
(b) 2.44 x IO
19 molecules/ml for each
10. (a) 5.99 x IO15
(b) 3.30 x 10-'°
(c) 7.74 x IO8
(d) 2.05 x IO6
(e) 1.43 x 10-'
11. 11 times faster