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C111Hel-prism F09 T1 - Please enter your final answers in...

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Unformatted text preview: Please enter your final answers in the boxes where appropriate and show your “iork for full credit. Remember to include units where applicable! 1. {20 pts total, 10 pts each) Serotonin (MW 176.2{g/mol) is an important neurotransmitter involved in the regulation of intestinal movements as well as a mood and other cognitive functions. Serotonin is 68.16% by mass carbon, 6.86% by mass hydrogen, 15.90% by mass nitrogen with the remainder oxygen. Determine the empirical and molecular formulas of serotonin. _ CM F06? T/ ' Chi—637C: ; 965)”! #323— Ale/[er n.» 90.01! i Z O ._._--.._. Note: Please list the elements alphabetically in your answers (ie, C H N O) empirical formula molecular formula MW 81 \ . f_,_.-——--— (10 pts) Cholesterol has a molecular weight . at 86.65 g/mo p,- d has a general molecular formula of CxHyZ, where Z is an unknown element. If cholesterol is 83.87% C and 11.99% H by mass, what is its molecular formula? “Q In other words, determine 2:, y, and what element Z is, and put it together as a molecular formula. 23.91:: ,396.6€s/_5- squm C, 3 {ooh} «9w ’ 3”“1 ‘ mes ~= (may a. 3. (10 pts total; 5 pts ea) Fluoride ion, 1‘", is poisonous in relatively low amounts: 0: - g of F' per 70kg of body mass within a day can cause death. Nevertheless, F” is added to tap water at a concentration of 1 mg F' per L of water. How many liters of tap water would a rson theoretically have to drink in a day to reach this toxic level? How man! atoms of F would th1 rson have consumed? ' 0 volume of water # of F' atoms M 17' I 145), aiwfi 4. (20 pts total, 10 pts each) In aerobic respiration, glucose (C5H1206) reacts with oxygen (0;) to produce carbon dioxide and water. Balance this chemical equation and determine how much carbon dioxide (in grams) would be produced by an organism via this route with an input of 175g glucose and 180g 02. What 9.0 is the mass and identity of unreacted reagent? an. Cali-",0; iQO & fl @CO "L iaizo Ho‘s-w [7’93 my D 5. (10 pts total, 2 pts each). Complete the following table: . #___ . r potassmm’fihosp ide L {Lr Clear] circle our answer: 6. (5 pts) Which of the following reaction mixtures would produce the greatest amount of product 6 according to the following chemical equation: 2H; + 02 —+ 2H20 a. 2351H2and2r£l3102 3114 A? L Ill ”1 Lilli! B L .2 Malt ”LB 2 1110le and 3 Efil o2 "1 mot: HL ~- c. 2111161 H2 alum—[1501 02 "11. , 3 1201 H2 and 121110102 ': 5k 5L; ' J i ”"6 If 01 TM. 01 - L. m)? UL” e. All of these choices would produce the same amount of product. \m W 3* 5-2:. m 7. (4 pts) The following is used as a propellant system for the Space Shuttle orbiter. Balance the equation. 2 2 i‘ % N2H4 + N204 —§ N2 + I ' “I120 / a ‘8’ s. (10 pts) The radius ofa helium atom is 3.1 x 10'“ m; the radius of its nucleus is 2.5 x 10'15 In. What percentage of the spherical atomic volume is occupied by the nucleus? V ofa sphere = 3*- ar3 i 9. (11 pts total; 6pt and Spts respectively) A 1.000 g sample of X1; is treated with a stoichiometric excess K: of silver nitrate (AgN03) to react with all of the XI; to produce 1.325. 3. silver iodide (AgI) fid an \ X5 undertermmed mass of X(N03)2. Determine the number of moles XI; that reacted and the identity of X _..._... 11km“ ' ”‘5‘; L 1i”. X11 rlflgNag fl”) 2931” KOWLZ “if l a XI; l 13%3 0573535 93: w flog” mom A51: mama: WW. J News» :1 W ; m3 1’ resizssy l male # moles X12 Identity of X tool‘l mulls ' ' E01 7K ...
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