I (C$) )(butane.chem.illinois.edu/chem204ta/quizzes/Quiz_2bKey_Jonathan.pdf3) Use the phase diagram for C0 2 shown below to answer the following questions: (5 pts) 10(]0 200 250 (JaS

Eller

Name: 12 o'clock 1 o'clock 2 o'clock (circle one)

Chemistry 204 Quiz 2b Tuesday 2/8111

1) The enthalpy of solution of CaBr2 in water is negative. (2 pts)

a. Does CaBr2 dissolve endothermically or exothermically?

2¥-o ! Ca. _.. l b. Which. is larger for CaBr2: the lattice enthalpy or the enthalpy of

hydration. 0 o •'VIet ,11h o-f« I ::- A 1-1, -tA t-h_ Ml Tu-lal < ; -f + be

11 _ t + 1 tll-1" , > , ,j 11. t I Elt ill ""'-tt..lpj- h yJM.--f, 'P<-- ru4_ ""' ; / (C$) /t!tllfe) .

, _.// 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)

s::: P- .. r ::: ( )( 5 -:.- 5, /L

I•

I

II V\

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)

().Y-'1 - I. oo 'IJ 0 .. --.... ,.. ....... """"........... - __ .. ......-.• ,_,...,..,..,

1

--------- ----------

3) Use the phase diagram for C02 shown below to answer the following questions: (5 pts)

10(]0

200 250

(JaS

E•

JOO 350 400

a) Which of the points (A-E) on the phase diagram represent a position of dynamic equilibrium? A, 15

1 p Drw-,·c... ft\A

p 1' e..l ( S c lt\d 1U ) b) What can we say about the sign of ilG for a system in dynamic equilibrium?

6 (, :::: 0 cet eg · c) Which single point on the diagram represents the location where T =

at the corresponding pressure?

-fl.v;.l i OCC().)\4 H\.t f btA-&1\cP.ar :J- h-t 5t> .f9.t

11f;v..'t:P. a. ... r ( ') .

2