PART C
Directions
Each of the incomplete statements or questions below is followed by five suggested
completions or answers. Select the one that is best for each case.
24 . The heat capacity for aluminum is 0.89 J·g−10 C−1, for iron is 0.45 J·g−10 C−1, and for zinc is
0.39 J·g−10 C−1. If 100 J of heat energy was added to a 10.0 g sample of each of the metals,
which of the following would be true?
(A) Al would have the largest temperature increase.
(B) Fe would have the largest temperature increase.
(C) Zn would have the largest temperature increase.
(D) Fe and Zn would have the same temperature increase.
(E) All three metals would have the same temperature increase.
25 . 2 NO 2 (g) → N 2 O 4 (g)
What is the heat of reaction for the above reaction given the heat of formation, ∆Hf, of
NO 2 (g) is 34 kJ/mole and N 2 O 4 (g) is 10 kJ/mole?
(A) −58 kJ
(B) −48 kJ
(C) 10 kJ
(D) 48 kJ
(E) 78 kJ
26 . What is the precipitate produced from the double displacement reaction of an aqueous
solution of lead (II) nitrate and an aqueous solution of potassium sulfate?
