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"'- I<tjp,"i ::>- 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? 1« f '::: I 'i. q; ::: 0'2­ )1... ~ f NOI3:~ I /lJOBn _ ~~ Pe4~ . . (.,frY·I» Pr(~l1 -::. (tr. lf) (.zrf'C. fr) :; ~ 11?.- ~(JtJlL ;; 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. p'L \'l- Q~ ~ ~;; 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? 'L LNG 1 ( [ +- f3 /)?,- ~ "LNoBIt L.Od (2..,06-~~t ;::, (2.X)'1- eX)