Quiz 6 Key - Chemistry 230 — Quiz 6 — Tellinghuisen KEY...

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Unformatted text preview: Chemistry 230 —- Quiz 6 October 17, 2001 — Tellinghuisen KEY Note: If you want your paper returned folded (1' .e., score concealed), please print your name on the back. Pledge and signature: 1. (15) Consider the reaction, N2 + 3 H2 :3 2 Nl-I3 (where all components are gases). ' (a) Write the reaction equilibrium condition in a closed system. (Be smcifilc for this reaction.) 22):.” =0 => #001) + Baum 2 ginning) (b) Suppose that initially a reaction vessel contains just 5.80 mol N2 and 6.20 mol NH3. At a later time 6.50 mol of N2 is present. How much of each of the other components is present, and what is the extent of reaction E ? AWL”; = 070 M => Aki‘i: 3x070 W: QJOM 0M AWNH3=';X0.70M=-I.H'0M ‘9 H91: 3.10 wt 3 M5: $.96 m1 Arms-12,; ..>,. g=—07omlz (c) Suppose the reaction is rewritten, N113: 1/2 N2 + 3/2 H2. Repeat the calculations of (b) for the same initial and final amounts of N2 and NH3. meoioflsmm. Cmq‘doa, M1_ AWL :: 0.70 M = $3 .2) =- €(Ji) . C) 2 :: i . L} 0 M 2. (7) For each of the following — CCl4(l), H(g), N2(g) -— (a) Write the reaction of formation from reference-form elements at room T. C(Wmt) + :1 (i1 (3) a (1.040;) ‘5. Hng) —a H (s) (b) Is AHf“ = 0 for any of these at 50°C? If so, which ones? (dc?) _— N; (8) 3. (4) For each of the following closed systems, write the conditions for material equilibrium between phases: (a) ice in equilibrium with liquid water. # [H90 (5)1 = N [H2 0a)] (b) ice in equilibrium with an aqueous solution of sucrose. # [H20 (:11. [H20 (5%)} it )k-[smcsowstmrm] (c) a two-phase system of ether and water, with each phase saturated with the other component. swoon]: Mama] Maintain ngmmfl f ...
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