Eller
Name:
12 o'clock
Chemistry 204
Quiz 2b
1 o'clock
(circle one)
2 o'clock
Tuesday 2/8111
1) The enthalpy of solution of CaBr2 in water is negative. (2 pts)
a. Does CaBr2 dissolve endothermically or exothermically?
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b. Which. is larger for CaBr2 : the lattice enthalpy or the enthalpy of
hydration.
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/t!tllfe)
(C$)
.
2) Neon gas is bubbled Into a 500.0 mL container filled with wa er at 293 K and at a
pressure of 570.0 Torr. The Henry's constant for neon in water at 20°C is
5.0 x 10-4 mol!L*atm. Under these conditions, how many moles of neon could dissolve in
the water? (4 pts)
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4) Assuming complete dissociation, what mass of KCl is required to generate an osmotic
pressure of 0.49 atm in 1 L of water at 298 K? (4 pts)
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3) Use the phase diagram for C0 2 shown below to answer the following questions: (5 pts)
10(]0
(JaS
E•
200
JOO
250
350
400
a) Which of the points (A-E) on the phase diagram represent a position of dynamic
equilibrium?
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p 1' e..l ( Sc lt\d 1U )
b) What can we say about the sign of ilG for a system in dynamic equilibrium?
A, p
6 (, :::: 0
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cet eg ·
c) Which single point on the diagram represents the location where T
at the corresponding pressure?
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=
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