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210-E4vC-ANS-SP09 - CHEM 210 ~ Exam#4 Spring 2009 Answer...

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Unformatted text preview: CHEM 210 ~ Exam #4 - Spring 2009 Answer Section MULTIPLE CHOICE ¢©[email protected]%ri9P oouc’xm-bwmm . ANS: . ANS: . ANS: ANS: ANS: . ANS: mmw>>>>c>>w00600>0>0 PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: m$ PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: y—de—d—I—Ih—lp—lt—lfi—Jp—lp—Ip—db—lb—IHHHHMM 1]): C Section:___ Chemistry 210 - Exam4 - Spring'2oee Name: DIRECTIONS: Please answer the following questions in the spaces provided. 1) (5 points) Write a reaction for which the AHreacgioa = AHofarmafion for 1.520(5). include states for all species. £-L~b£$§*§” 3; 0&éfi} ”“9 L{&Oi§§ 2) Consider the reaction: 2 com) + 02(9) -> 2 002(9) A) (8 points) Calculate AH for the reaction above given the equations below with the enthalpies indicated: (2 0(3) + 02(9) "‘5 2C0(g) AH m""266 k.) D X f. é mg 453% :ate es“ {0(5) + 02(g) "‘9' 002(9) 4 AH =-~393 kJ> K wk % 3 X4?“ @5533? MQX Aft: “" 1%:9 L3 B) (4 points) Draw an energy diagram that illustrates the relationships of the AH values for each of above reaction steps and the overall reaction. ' AH (kJ) Reaction coordinate 3) (9 points) Consider the reaction: CHgCHg + H20 *9 CHscHQOH Using bond dissociation energies, estimate AH of the reaction. Partial credit given for correct structures. x), it /;:“‘x _\ W/ 4) (14 points) In the lab astudenwaerma nerusmgaBunsen burner, which burns methane gas, CH4 (Mm — 16 04 g/ moi), in a complete combustion reaction. + + 2 5M W. 3 1.3: "?'1i-x’-%%’ ¢ sees?“ SQMeepoi We Eg- 455% 1f 65. 0% of the heat produced by the combustion of 5. 00 g of (311415 transferred to the water in the .sbeaker, What mass of watér can be heated from 22 0°C to 100. 8°C. 7 ”fiaxm”: fiflafi Mfg” we a??? wé/7g,){ eggaf/céYegmflj b {We ...
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