Practice Problem Set 6 KEY

Practice Problem Set 6 KEY - CHEMISTRY 1414 Fall 2011...

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Unformatted text preview: CHEMISTRY 1414 Fall 2011 Practice Problem Set 6 Question 1 A sample of sodium perchlorate is decomposed according to the following reaction: NaClO4(s) -> NaCl (3) +102(g> BMW: PM “oh The oxygen gas produced is collected over water at 1935 °C. If the gas is collected in a 425 mL container and the total pressure exerted by the gas sample is 0.855 atm, what mass in grams of NaClO4 was decomposed? The vapor pressure of water at 19.25 °C is 16.7 torr. : O . 0 no MM PD 1PT‘W5PM = DMSMw- 0.0110 MM“- 0,%3;HM n01: fay: Hammond) _- 0.0)‘1‘AM01 f” (5.03104, :33) (mum 0.016%. DL(MM}LLW’>3 )1 0.0{043/1/flqgk LmloL HM MUD. MN: §L.\¢b7l”“" Bog—'7“ - ~\ Questionz E /’l ) Calculate the density of silane (SiH4) gas at 32.5 °C at a pressure of 1327 torr. A: /’M., ('.7‘1LMM\(%1-l3jmfl ~ : KT (0.0110413) (30mm Molk Question3 7' R H“ A sample of helium gas at a pressure of 855 torr occupies a volume of 328 mL. If the pressure changes to 1.22 atm, what volume will the gas occupy? Pym: P7. Vt, s VL: RV: ‘ r \A Fl l-LL’HM = 30%»«L Question 4 ’ P4, 1 H“, Convert 2.340 1b in'1 h“2 to atm (h = hours, in = inches). ‘1 MS‘ 1.3mm. 'M M (lbowflf‘ 123.11HXI0“P* W M LLoHL 15%,.“ ",M scoot») A 3,L1‘1>L10“h( (42m \23.)szl0"'4rm \oiazm - Question 5 A gas cylinder contains 22 % nitrogen, 31 % oxygen, 18 % neon, and 29 % hydrogen by moles. If the total pressure in the cylinder is 1.21 x 105 Pa, what are the partial pressures of each of these gasses? PMXU’M, = (uni-two?“ 1,7 mm 5' - L4 POL: fathom, 0-?lfil'MM0 P4 x 3.31m PA PNQ:XNLP‘HN1‘- O.i3*lillxlofr4~: Z'1>L'01F4 PHL: XHLPNN‘: 0,2,oi1 i-LlX(OTF4'-‘ PA 7. L. k Question6 }\ Cl 7 A sample of argon gas occupies a volume of 310.5 mL at 19.5 °C. If the temperature increases to 66.5 °C, what volume will the argon occupy? \ Rank Vl .‘ VL ( v y a - s VL’VtTL 3 05M .7“ Ti 11 m... ermn T4 Z?L.7K Question 7 The Haber-Bosch process for the synthesis of ammonia proceeds according to the following equation: 3H2(g) + N2(g) '92NH3(g) If the initial hydrogen/nitrogen gas mixture occupies a volume of 176 L, and enough nitrogen is added to completely consume 44.32 mol of hydrogen, what volume will the ammonia generated occupy if the pressure and temperature are held constant? Molar All mi : Warm: Hi (I Mal/V1 ) = How Max N1 3 mol “1. Mbl‘zr r/LOJUUJJZ [41(LMJ : n7- BMIIHL MDI‘U' WT: V%-31m.\+|‘1-77M\l1 COLD“ Ms! :A‘ VI UL :3 VLZV‘nL ‘ 1 \ v‘rfl ~ - r\. “L n, Mel Question 8 Tetrahydrothiophene C4H88 is typically added to natural gas mixtures to provide a strong odor so that leaks in the plumbing system transporting the natural gas can be detected. The tetrahydrothiophene contained in a 525 mL lecture bottle at 132.5 °C exerts a pressure of 1.73 bar, while a 6.75 L cylinder of methane CH4 at 56.3 °C exerts a pressure of 1273 torr. If these two gasses are completely transferred to a new 12.5 L cylinder that is at a temperature of 23.8 °C, what pressure will the gas mixture exert inside this ' 9 . cylinder. '315eL : K1097“ LW), 34L: L‘Il MM lldihmsliWS/HW $672°L12Ulgk nthibs z ill (MIWHOIUM 1M -. o. ‘ M lw‘szfl (‘lamm DUO M (“43? “w = Oar-M'Ww [0.0%LOL ZULSK) fin,“ : 0-0170'Mol + Md 1 NW P: “Tow/LT_ (pharmatoomoei't—m (NHL) ‘5 m : 0, M V IML Km H Question 9 The atmospheric pressure in Kenton, OK on onday morning was steady at 30.18 inches. Convert this value to: Tom 30.» H», (1"ch Ma) U033“ llfim 7 7494mm PSI 30.n55NH‘) Ulwl’n = (“mpg H/ul‘l‘] [w‘ \léDMH‘j Pa go Vb M, H.‘ (ISM/uh "1.011 HD‘IPA [IA/I13 (CM jéoMmHj atm 20 ($.51 H)(fl1’fi)( (mm) [W ‘ I 007 HM / "N H1 (an ( 7g'0‘mua) b: at 30 WW [+1W7)(10M)(IOI%LSP+> &5 (fr) H] lam 760M; [Mos/’4 : I 0L1 3M Question 10 How high would the column in a barometer that uses methanol rise for the pressure given in Question 9, given that the density of mercury is 15.534 g/mL and the density of methanol is 0.7918 g/mL? 30495:” H31 jéél MmHj klo\l:l‘k°\l 11L: : Qwémlhfils‘nfl/ML) L : LSOLlHOH " ISMM ...
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Practice Problem Set 6 KEY - CHEMISTRY 1414 Fall 2011...

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