Chemistry Worksheet With Answer Key - Chem 10113, Quiz 1b Page 16
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24a
e
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a
bond –
“side-to-side” overlap of p orbitals
deposition –
phase change from gas to solid
11. (18 points) SHOW ALL WORK. The vapor pressure of CCl
F at 300 K is 856 torr.
3
If 11.5 g of CCl
F is enclosed in a 1.0-L container, will any liquid be present? If so, what
3
mass of liquid?
856 torr x 1 atm = 1.1263 atm
760 torr
n = PV = 1.12632 atm x 1.0 L = 0.04575 mol
RT
0.008206 Latm x 300 K
Kmol
0.04575 mol x 137.36 g = 6.2845 g; so 11.5 g – 6.2845 g= 5.2 g
1 mol
yes; liquid will be present
12. (15 points) SHOW ALL WORK. Given 425.0 g of hot tea at 78.0 °C, what mass of
= 4.184 J/g∙°C and
ice at 0 °C must be added to obtain iced tea at 15.0 °C? For tea, C
s
H
for ice is 6.01 kJ/mol. [note; to simplify, ignore the contribution of the melted ice
fus
warming to 15 °C.]
q=m C
T
s
q=(425.0 g)(4.184 J/g•C)(63.0 C) = 112026 J needed
112036 J x mol
= 18.64 mol ice x 18.015 g/mol = 336 g
6010 J
16
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