quiz 1 - CHM 2045EG UIZ 1 Form A ' PRINT NAME ' Sgaflwg s...

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Unformatted text preview: CHM 2045EG UIZ 1 Form A ' PRINT NAME ' Sgaflwg s UFID - Show all your work neatly and organized in each space. Scrap paper is provided, but will not be collécted. ' 1. The toxic gas hydrogen cyanide (HCN) is produced by the high-temperature reaction of ammonia (you need to know formula) with methane (CH). Hydrogen is also produced in this reaction. Suppose 500.0 g methane is mixed with 200.0 g ammonia. Calculate the masses of each substance after the reaction has been allowed to proceed to completion. (10 points) “"430!” + CH“ (3) a He”) ( ) +3 “2‘ y 9 a * 500.03C‘4q ' i = 3H7 I CH 17.0313 ml" . 4 * NH3 $5 iimi‘i’ins. react-an“? and mo\ radio is iii ’ MHCN =(|\.7"\ and NH ( \Mo‘ HCN)(21.OZQ .- ( ) Imot NH; ml HCN ~ 3,133 HCN Q ‘ MA = ".7". mo! NH 3mm H m - Imol NW3) 8) ‘ ' @ mot Hz pman -.- (3m ~ H.7H ‘E'O‘BS ) _ 0' (A ‘ Moi CHI, . ' 3 L, ® 0 2. Burning a compound of calcium, carbon, and nitrogen in oxygen (in a combustion reactor) generates I \ e 0' calcium oxide, carbon dioxide, nitrogen dioxide, and no other substances. A small sample gives 2.389 g CaO, 1.876 g C0,, and 3.921 g N 0,. Determine the empirical formula of the compound. (10 points) moi Cm: mel C40 : 23399 @: Ankle. ends 56.0114 3mm" k“I molC 7. M00 coz : "876; _,_ 2 M‘ " P “‘2. 94.010 film" Moi N: Mal (do: = 3.92! 3 «c.0055 3 m4" Emp. FMMU‘CL = @ OVER _. ' 3. Naturally occurring rubidium (Rb) consists of two isotopes: asRb (atomic mass 84.9117 u) and 37Rh (atomic mass 86.9092 u). The atomic mass of the isotope mixture found in nature is 85.4678 u. Calculate _ the % abundances of the two isotopes. (10 points) L€+ x ,_ ‘Fra 0H ona‘ wa‘a 95 R b '- 2. H u X(84.9I|7M) +(l'x)(359092,4_) .—. 85H578A. @ X: 0.72M, = l—X: GD , 4. Give the formula or name for the following in the blanks below. (10 points, 1 point/blank) z... Sulfite ion 3 2 .- . Dichromate ion C (to: Permanganate ion M n 01-] Acetate ion C H C o Chlorate ion C l 03 (Bicarbowe m). Hco; Hydrogen CarLoM‘k 1'06 SF6 L Sulfur hexaCIuoéide N205 . Dink-03:14 Purl-oxicla- A ‘ Ca(ClO)z Calcium kgeocklori‘l'e " BC13 ‘ Baron +ri$luoricl€ 5. For the expression Pb(N03)z(aq) @(aq) —> LS) 4' K No.3 {44‘ (5 points) I A) Complete the balanced reaction in the blank above. 2* '- B) Write the complete net ionic reaction here. P + Z I A %r1 ‘5 (5 Points) CHM 2045EG QUIZ 1 Form B , PRINT NAME $25 511'] cu S UFID - Show all your work neatly and organized in each space. Scrap paper is provided, but will not be collected. 1. Burning a compound of calcium, carbon, and nitrogen in oxygen (in a combustion reactor) generates calcium oxide, carbon dioxide, nitrogen dioxide, and no other substances. A small sample gives 2.389 g CaO, 1.876 g C0,, and 3.921 g N02. Determine the empirical formula of the compound. (10 points) Sag, Form'A 1"-2 Solufioa 2. The toxic gas hydrogen cyanide (HCN) is produced by the high-temperature reaction of ammonia (you need to know formula) with methane (CH). Hydrogen is also produced in this reaction. Suppose 200.0 g methane is mixed with 500.0 g ammonia. Calculate the masses of each substance after the reaction has . ' been allowed to proceed to completion. '(10 points) N + CH“ HC + 3“: (j s _2_ ) ' l5.0‘133fl|orl ' = 29,35 mann3(xs)i '3 500.0 3 N03 . ‘ I7.0313ml" CH... '5 L3. 5‘ Rum‘l'én-l' moi ral-io 15 "' "‘ch 2:02.47 := 337.0 3 “C” 1 Mo! CH... Mal HCN -' M -.-: 12.47mlcu 3”““1 (2-‘3‘53 3) = 75.4: H a ‘ “z ( 0(m) mm H; 3 z C2) Mal M143 ' , ' . 2.97molCHq(I-R) OVER —) 3. Naturally occurring element X consists of two isotopes: 96X (atomic mass 95.9117 11) and 98X (atomic mass 97.9092 u). The atomic mass of the isotope mixture found in nature is 96.7678 u. Calculate the % abundances of the two isotopes. (10 points) ‘I + x z om‘ “bowl ‘ 45X ‘t 63x 4. Give the formula or name for the following in the blanks below. (10 points, 1 point/blank) . Sulfate ion 503 ' CO,“ CO! ban 4+ C. ‘0 fl . 1... Chromate ion C r031- I UF6 Uf‘t’fi U M ktzd‘c’lUOP: ' Perchlorate ion 3.. P205 Dipkbsflko‘" GUS EA? 1 ‘ Acetate ion "H 3 ('03., KClO Poi-ass WM .‘jEO Q [9“ Phosphate ion V "3&3?" SClz Sufism dichloécle . v _ 5. For the expression Ca(NO3)2(aq)-12(F(aq) --» Ca. F?- Q5 1 + 2 K I (5 points) A) Complete the balanced reaction in the blank above. . 2+ .. ' r B) Write the complete net ionic reaction here. C4 I 7 C4413 '9 C.sz (rs >15 points) ...
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This note was uploaded on 02/11/2010 for the course CHM 2045 taught by Professor Mitchell during the Fall '07 term at University of Florida.

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quiz 1 - CHM 2045EG UIZ 1 Form A ' PRINT NAME ' Sgaflwg s...

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