Exam 1 p1 - CHEM 1B NAME(LAST(First Show all calculations...

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Unformatted text preview: CHEM 1B 2/6/2006 NAME (LAST) (First) Show all calculations, and include units where applicable. Also remember to round off final answers to the correct number of significant figures. 1. (a) For the generalized reaction,uA -) B, write a mathematical definition for the "rate of reaction". (This is not the rate law.) Rate=__ MA] zlAl‘AD where: A; and A. are Come: a? A At £1.43! (Xi: t=’L 42ml (3:! RAW (b) Consider the reaction: 4 PH3(g) —> P4(g) + 6H2(g) For every mole of PH3 that disappears, how many moles of H2 are produced? l P imoQ VH3“ M. —— [.5 Mel HL; 1.ng PREAW’O'ngfe' Lima! PH3 . Lin-A3 P_H3’ (c) If, in a certain experiment, over a specific time period, 0.0057 mol PH; 15 consumed in a 2.0 L container each second of reaction, what are the rates of production of P4 and H2 in this experiment? AWHA:.—0mos7 m»? m /2L = -194; x10"? a /s 911; “MM; bi: ‘ 9“ - , P . “l . P - . blag-i + 1,85Klo 5W°Q/(L.se¢) x LMLJ— —_ + 7' X10 "We ll/(Laeé) .T 3 Li “at PK; 15 , - '3 ) L> CHJl 2.851063 We W30. v 3 x Angel» = + ”'3 K '0 ”‘1 H"/(L-e‘“) 1‘ .$€< . T if Moe PH"; 0R M— /S 2. The following data was obtained for the reaction, 2N0 + H2 —) N20 + H20 Experiment Initial [NO]0 (mol/L) Initial [H2]0 (mol/L) Initial Rate of Disappearance of NO (mol/Ls) 1 6.4 x 10'3 2.2 x 10'3 2.6 x 10'5 2 12.8><10'3 2.2x 10'3 1.0><10'4 3 6.4 x 10‘3 4.5 x 10‘3 5.1x 10'5 (a) What is the order of reaction with respect to NO ? (Explain your reasoning g show calculation.) (b) What is the order of reaction with respect to H2 ‘7 (Explain your reasoning g show calculation.) Rate. L ,_ e1 (N031 WA" Jim @4660 .(2‘1X‘0'Q * - 2.6m" 1% .___¢-— ’- ——_"—’——’ y; . _; i “ate '5 (i rm" U1 1* -9, (0.11m? to MEMO“? SM“? M t ” :1 baublivfi W03 9'0» “may; 4., 12.8xlg’55 £03 (038% :M‘ID) ') resuits in a, firuadrupihi “it He. ral'e 13 £03693“: 23362.5“ ifs-M l-émd’fi loxto‘fl/‘S :9 04"?— 3 :. ’l. (c) Write the rate law expression for this reaction. (Oder taint Hz) Rate : 1L [No]2 01,] (d) What is the approximate value of the rate constant u -' eaction? (a) 1150 (b) 98 (c) 542 (d) 112 f. - . (e) What are the units .-2 - : . tant for this reaction. (a) L/mol-s (c) mom-S (d) s-2 (e) L‘2 ...
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