Chapter 7: 3, 4, 5, 6, 8, 9, 11, 15a-c, 18, 23, 31

Hints/comments:

Use Table C.2 where appropriate

7.3) Note: I = E/R, Power = I²R (in Watts or J/sec)

7.4) Assume that "molar" means "molal". For dilute water solutions molarity and molality are approximately equal.

7.5) You can assume that since the ionic strength of the Ag₂CrO₄/H₂O solution is very small, gamma = 1 in this case. Recognize that the equilibrium constant for the dissolution process is the same in both pure water and NaNO₃.

7.6) part b : the answer in the back of the book should be 0.08 m.

7.9) See section 7.6 in the text. The answer in the back of the book for part a is too large by a factor of 10.

7.31) To determine the number of electrons involved in each reaction, consider the half reaction for the formation of H₂O from O₂ and H⁺ (focus on the number of electrons per O₂ molecule)

For 7.31b), the answer should be 1.150 V.