Chemistry 112 – Elementary Inorganic Chemistry
Morehouse College – Problem Set 6
DUE: Wednesday, April 9, 2008 in class
Answer all questions in the space provided, neatly written. Thanks.--BML
1. (1 pt. each) For each of the following questions, circle the BEST answer (no
explanation is required for full credit).
a. 1.219 kJ of heat are required to raise the temperature of 250 g of an unknown
metal by 64 °C. What is the specific heat of this metal (in J g
-1
°C
-1
)?
2.0 x 10
7
1.3 x 10
1
3.1 x 10
-2
4.8 x 10
3
7.6 x 10
-2
b. Based on your knowledge of thermodynamics, which of the following statements
is FALSE?
Kinetic energy Energy is Heat moves from none of these
is the energy of the capacity to a warmer body to
motion do work a colder one
c. 708 mg of C
6
H
12
O (
∆
H°
f
= -890.7 kcal mol
-1
) undergoes complete combustion in
a bomb calorimeter with heat capacity 2.70 kcal °C
-1
? What is the final
temperature if the initial water temperature is 27.0 °C?
24.7 °C 26.6 °C 27.4 29.3 none of these
d. Which of following substances has a standard enthalpy of formation of zero?
That is,
∆
H°
f
= 0 kJ mol
-1
?
I
2(g)
Ar
(g)
Br
2(g)
O
3(g)
e. How much work is done (in J) when a gas expands by 24.0 L against a constant
pressure of 75 atm at 45.3 °C?
1.8 x 10
3
-8.2 x 10
4
8.2 x 10
4
-1.8 x 10
5
none of these
