Chem 2A Exam 1. First letter of your last name
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1 Frst letter of your last name NAME: PERM# INSTRUCTIONS: Fll n your name, perm number and frst ntal of your last name above. Be sure to show all of your work for full credt. Use the back of the page f necessary. Useful nformaton (perodc table, equatons, scratch paper etc..) s on the last two pages. You may tear them off for easy reference. 1
2 SCORE: 100 pts possble [1] (5 pts) Assgn the oxdaton state of ntrogen n each of the followng gaseous molecules: N O 3 NO N O 4 NH 3 NOCl [] (5 pts) What mass of magnesum bromde s requred to prepare 50 ml of a soluton that s M n bromde ons? [3] (8 pts) Balance the followng redox equaton n acdc soluton Mn ( aq) + NaBO ( s) MnO ( aq) + B ( aq) [4] (4 pts) Wrte the chemcal formulas for the followng compounds a) calcum chlorate b) alumnum oxde c) ferrous phosphate d) cobalt(iii) sulfte
3 [5] (8 pts) An engneerng student s asked to calculate the pressure of a 000 L reacton vessel contanng moles of SO gas at a temperature of 50 o C. The student uses the deal gas law for the calculaton. Calculate the dfference n pressure of the student s result wth the more accurate pressure determned usng Van der Waal s equaton? Is the deal gas law approprate to use n ths nstance? [6] (1 pts) A 1.35 gram sample of a popular analgesc medcne known to contan C, H, N, and O s subjected to combuston analyss. The ntrogen s converted to NO durng the combuston process. The products of the reacton are found to contan grams of carbon doxde, 0.74 grams of water and grams of ntrogen doxde. Calculate the emprcal formula of the compound. 3
4 [7] (15 pts) Potassum Chromate (K CrO 4 ), a brght yellow sold, s produced by the reacton of chromte ore (FeCr O 4 ) wth sold potassum carbonate and gaseous oxygen at hgh temperatures accordng to the unbalanced reacton below. In a partcular experment 169 kg of chromte ore, 98 kg of potassum carbonate and 75.0 kg of oxygen were sealed n a reacton vessel and reacted at hgh temperature. 194 kg of sold potassum chromate (K CrO 4 ) was obtaned. Calculate the percent yeld. FeCr O ( s) + K CO ( s) + O ( g) K CrO ( s) + Fe O ( s) + CO ( g ) [8] (8 pts) A 3.91 gram sample of znc metal s placed n a.0 L sealed vessel contanng 1.5 atm of HCl (g) at 5 o C. The excess HCl gas reacts wth the metal to produce ZnCl (s) and H (g). What s the pressure nsde the vessel after the reacton s complete? 4
5 [9] (15 pts) A chemst weghs out 5.14 grams of a mxture contanng unknown amounts of BaO (s) and CaO (s) and placed the sample n a 1.50 L flask contanng CO (g) at 30 o C and 750 torr. After the reacton to form BaCO 3 (s) and CaCO 3 (s) was completed, the pressure of CO (g)remanng was 30 torr. Calculate the percent mass of BaO (s) and CaO (s) n the orgnal sample. [10] (6 pts) Several assumptons were made n the development of the knetc molecular explanaton for the deal gas law. Van der Waal s equaton s an attempt to correct for two of these assumptons. Explan what the Van der Waals a and b constants correct for. The Van der Waal s a constant corrects for. The Van der Waal s b constant corrects for. 5
6 [11] (8 pts) The manufacturer of a nutrtonal supplements clams the each tablet of Cold Buster 000 contans 500 mg of vtamn C (C 6 H 8 O 6 ). The vtamn C content can be determned by ttraton wth standardzed NaOH soluton. A gram sample of KHP (KHP = C 6 H 5 O 4 K, MW = 04. g mol -1 ) requred ml of NaOH soluton to reach the endpont CHOK OH CHO K + HO A tablet s crushed and dssolved n 5 ml of water and placed n an Erlenmeyer flask. The sample s ttrated wth the NaOH soluton standardzed above requrng ml to reach the endpont. - - CHO + OH CHO + HO a) What s the concentraton of the NaOH soluton? b) How much vtamn C does the tablet actually contan? [1] (6 pts) Concentrated phosphorc acd (H 3 PO 4 ) s sold as an 85% by mass aqueous soluton wth a densty of g ml -1. Calculate the molarty, molalty and mole fracton of phosphorc acd n ths soluton. Treat water as the solvent. 6
7 Equatons x = n x s = ( x x) n 1 μ = x ± ts n PV = nrt R = L atm mol K R = J mol K N 0 = amu = kg PV nt PV = nt n P+ a ( V nb) nrt = V nrt n P= a V nb V Selected values for Van der Waals Constants Molecule a (atm L mol - ) b (L mol -1 ) NH HCl SO
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