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QUIZ #3
SC112, Spring 2016
Prof. M. Elert
NAME
R = 8.314 J mol- 1 K- 1 = .08206 L atm mol-I K- 1
T(K) = T(°C) + 273.15
The equilibrium coustant Kp for the reaction 2NO(g) + Bn(g)
;;:::t
2NOBr(g) is 18.4 at 25°C.
1. (4 points) What is the value of Kp for the reaction 2NOBr(g) .z 2NO(g) + Br2(g) at 25°C?
J<, ~ X'd.1f -: :-
,os-I.{- 3
2. (4 points) What is the value of Kc (that is, with concentrations expressed in mollL) for the reaction
2NO(g) + Br2(g) .z 2NOBr(g) at 25°C? 2-3
6.1\ =-
1< f
-:.
{(c;:
1< c (,zr)
c-} 4"'-
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::>-
J~/JZ -r ~ ((8.lf)(.O~2()6')(~9~):::' '+5'"0
Q
3. (4 points) If an e!luilibriu1ll mixture of Br2, NO, and NOBr at 25 C contains Br2 at a pressure of 0.15 atm and
NO at a pressure of 0.25 atm, what is the partial pressure of NOBr?
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0'2­
)1...
~ f NOI3:~
I /lJOBn _
~~ Pe4~
. . (.,frY·I» Pr(~l1 -::. (tr. lf) (.zrf'C. fr) :; ~ 11?.-
~(JtJlL
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4. (4 points) If a mixture of Br2, NO, and NOBr at 25°C is prepared in which PBr2
I,
..
lI-'-- ArM
= PNO =
PNOBr = 0.10 atm,
which way will the reaction 2NO(g) + Br2(g) .z 2NOBr(g) proceed? Explain.
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~
~;; P,3'\z
Rf:AC71ol\}
_
_(./OJ.
:;,
(.iof-(t o) to <
W/f..,L pf?-oC£(1)
TO rilE ~ ...
5. (4 points) Suppose that 2.00 atm of pure NOBr is placed into a container at 25°C and the system is allowed to
come to equilibrium. What is the final pressure ofBr2(g), in atm?
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LNG
1
(
[
+- f3
/)?,-
~
"LNoBIt
L.Od
(2..,06-~~t ;::,
(2.X)'1- eX)
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