CH
ExI_solns-1

ExI_solns-1 - Explicit values for-version-version is...

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CH201 Examination I solutions and references Explicit values for α -version β -version is directly analogous . Problem I. See WA Q01, #s 2, 5, 7, 8. Exp. 1.6 of text. Mass percent oxygen: % 6 . 20 100 350 1 . 72 = × Tot mg mgO (19.4% on β -version) Empirical formula: mmolC mol mg mgC 57 . 13 / 12 8 . 162 = mmolN mol mg mgN 77 . 6 / 14 8 . 94 = mmolH mol mg mgH 1 . 20 / 01 . 1 3 . 20 = mmolO mol mg mgO 506 . 4 / 16 1 . 72 = Divide by the smallest, 4.506 to obtain 3 C; 4.5H; 1.5N; 1O => C 6 H 9 N 3 O 2 Problem II. Q03 # 1, 5; Exp 2.1, 2.22(a) and (b) g mg mmol mg mL mmol mL 4 . 50 10 05 . 5 9 . 241 85 . 0 245 4 = × = × × M M iM Mc 4 . 3 85 . 0 4 = × = = I = 4 since ( 29 - + + 1 3 3 3 3 3 NO Fe NO Fe one formula unit of iron(III) nitrate makes four total ions in solution. β -version has 76.0 and 2.32M respectively. Problem III. Q05, #s 2 & 3 (especially #3); practice example 2.14; Exp 2.25 Both versions: c c b b b c b m m k T T m k T = = - = - = 368 . 0 71 . 1 95 . 55 58 . 56 m c = m since i = 1 for a non-electrolyte. solute mol solvent kg solven kg solute mol nsolute 2 10 00 . 4 1087 . 0 1 368 . 0 - × = × = mol g solute mol solute g M m / 8 . 93 10 00 . 4 75 . 3 2 = × = -

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Problem IV. Q05 #1d, 2; Exp. 226 & 2.27; Problem 2.51.
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• Fall '07
• Warren

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