Ch6_ thermochemistry-Ans.docx - CHEM 101 Worksheet NAME _...

CHEM 101 Worksheet NAME _____________________________________
Chapter 6 Thermochemistry Worksheet
Reference Info
Density of water = 1.00 g/mL
C
s
of H
2
O = 4.184 J/ g • C.
1. A gas absorbs 300 J of heat energy and performs 2030 J of work as it is compressed. Calculate the total
change in internal energy (ΔE) of this process.
2. At constant pressure, q =
(e)w
3. The heat change for ammonium nitrate, NH
4
NO
3
, when 4.98 g are dissolved in 50.0 mL water is 1325 J.
What is ∆H
solution
in kJ/mol for ammonium nitrate?
a. The temperature of the water in this experiment decreased. Is this process endothermic or exothermic?
b. What is the sign of ∆H
solution
? ___
4. A sheet of gold weighing 10.0 g at a temperature of 18.0 º C is placed on sheet of another metal that weighs
20.0 g and is at a temperature of 55.6 º C. The final temperature of the metals is 50.7 ºC.