Quiz 3 Key - Dr. Loza Name Chemistry 121 Fall2008 Quiz3...

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Dr. Loza Name Chemistry 121 Fall 2008 Quiz 3 Tuesday 8:30 am October 14,2OOa 20 minutes [03 *\7 - ca3p2( ", . h;,ou, ---+ l3r"arrtz (aq) + ftd:*r, f,^(S n!s) Calculate the percentage by mass of hydrogen in ascorbic acid: HCoHzOo. tr?9F 8(i,uo) I qrlz .a.\ i b Lib.uc,) = tl b.oo qns % u- ,.. 'T\ fd" / .rt-?'cD. Cic,D = \'Ssl 6 67t, YL' WW6 i lr fr ,Nce,Vtzfcr s€" rtoks\'Q 3. (5 pts) calculate the number of nitrogon atoms in 3.11 x 1e-2 mol of Al(Nos)s 3 rf xf D trt Afud, , .3 avrr* N b.* ",olr'** : ,:*,1, Ai(n?t Gt, AtL( K) ---@ s.bznow N kw, - l'p') YOU tr,lUST SHOW ALL WORK TO RECETVE FULL CREDTT 1 . (3 pts) Balance the following equation: i7b,QO Q3A
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iir^) dtrt 4. (7 pts) Determine the empirical formula of the compound with the following corpoiiiion by mass: *.;T 14.6o/op ^azot.ftf) ,tD y'. :s.21,, I li't& = t..ltrl m"(,t/r.,niq ' ;J,.tI a v 0 zi.l ?" lYu6 x #,^=a"q,tffiP/o'"ttr'1 1fuc) '"tr kv rAD CI: ^.rb r ,w- F",rX &Jo lo.L|tl .= _:,,0'' - r lc37o,1 fut- ) 5. (10 pts) The complete combustion of octane, CaHra(l), the main component of gasoline, produces carbon dioxide and water' Write a balanced chemical eouation for the reaction. cbvl,p,ii) * jV,.!t> u,Bfr'2tX\ + Jtzot\* u''; i;i;;''', Y':'<941'9i'' d6 #'t ;'u';tb l{vJ fr{ How many grams of oxygen are needed to burn 5.0 g of octane (MW of octane 114.00 g/mol) 5.DX nnr^r W*Yt 'r , ";*'r* lv. .' Zga-lo.z 5_20ft2e- = zulurtW ,ru{oe, t't 5ft % C-^ w A 0,P Q]A
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Dr. Loza Name
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This note was uploaded on 10/22/2008 for the course CHEM 121 taught by Professor Wyzlouzil during the Spring '07 term at Ohio State.

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Quiz 3 Key - Dr. Loza Name Chemistry 121 Fall2008 Quiz3...

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