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chm 151 quiz 5 - CHEMISTRY 151 QUIZ#5(25 points A NAME...

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Unformatted text preview: CHEMISTRY 151 QUIZ #5 (25 points) - A February 28, 2008 NAME Hildebrandt Please ut our name on the back of air Pleas P m Clearly I.- (4 pt) Calculate the molarity (M) of a solution prepared by adding 4.82 grams of I{3PO4 into 25 0 mL volumetric flask and filling to the mark with water. 3 4 ' g , -. ‘- ”vomit-Ems ,5. 5 5.. mixes- Mumwfitluiee d/dllfiu/mca. : mg 3 ‘1 0.0’1l0m H141: Solution ago-mi”- manure.— . @333 "Wk/1 W L 5:. 2. (4 pt) What is the mass of solute, in grams, in 23.27 mL of? 002.35 M solution of KClO‘1 ? (gt-{7:910 imit-ayclaflfli ‘9: 'fl\\ ,U‘ ‘L'NUUld-a J] I m I} My} (dressage-imam? L c Sq 7X10 ”W L- . 3. (4 pt) Water was added to 7.20 mL of a 6.15 M NaOH solution until the new solution had a final volume of exactly 472 mL. What is the new a " ' gm“) 3 concentration (M) of the final solution? . . a «.1 Ca. 1 Sir. (, (007.10: M; (mm. m. L Q 2 = moor 33 m ' .- 73w lugs-1E5 “RX-“(3.35130 151 Q“; r1>£pLij¢11l£R6 Li 4. (4 pt) Bromine is obtained from seawater by the following reaction: _ c1 + 2N B 2 N C1 + B C‘? ‘ 70'9 ”We 2 (a) - a 11an =, a (as) :2 (Liquid) NaBr = 102.9 g/mole . NaCl = 58.4 g/rnole What mass (in grams) of BIZ is produced by the complete reaction of 225 111L Biz — 159.3 gniiule of 0.243M NaBr? freeman—s»? é 5H3 ‘Eflga‘stmy emSaY-awo lunar r—fi - . K . r “"imnleofl. ; was; . l (,3 L195‘17mwb JJQEFI'W'LWL )5 n.73x/0'?W%6:; 373%: F (”Music 1! U66 6er 3 mm Ida 3r 5. (5 pt) A 0.5608 gram sample of impure sodium bisulfite was analyzed in the lab. N OH 40 g! 1 _ . _ . . . . . . a — mo 0 usmg the tollowmg titration reaction. Nat-11503 4* N aUH => Na2b03 + H20 NaH803=104 g/mole and NaOH as the standard titrant solution. The impure sample of NaI-I803 required 16.76 mi of 0.1123 M NaOH to reach the end point (turn pink). Calculate the percentage of NaHSO3 in the original impure sample. hivjlww XJDOL (.IIQBXfiIE'fl’X lO‘i' WOO : Sf-‘IVPltW =seog BHR O % llaHSDs 6. (2 pt) A Lliei'iiiudyiiauiic system that allows transfer of energy (heat) and nut Iiiass from the system to the surroundings is called M: an 13+ [A] an open system B . s 5 stw [C] an isolated system %: '1‘ [D] a standard system [B] a closed system . a ”Ml 7'; (2 pt) Given the three statements below, which answer is correct? (a) For an endothermic reaction to be carried out, heat must be supplied from the surroundings. 3‘00 (b) An exothermic reaction releases heat 31 the surroundings. 9309 (c) The sign of AH for an eigpfltherrnic reaction is negative. 32.0 [A] a and b are true; c is false [B a and c are true I) is false [C] a and b are false, c is true [D1 3', b, and c are all false E] a, b, and c are true ...
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