GASES Free Response worksheet

《GASES Free Response worksheet》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、AP*GasLawFreeResponseQuestions19712HCOONa+H2SO4→2CO+2H2O+Na2SO4A0.964gramsampleofamixtureofsodiumformateandsodiumchlorideisanalyzedbyaddingsulfuricacid.Theequationforthereactionforsodiumformatewithsulfuricacidisshownabove.Thecarbonmonoxideformedmeasures242milliliterswhencollectedoverwaterat752torran

2、d22.0°C.Calculatethepercentageofsodiumformateintheoriginalmixture.1971At20°Cthevaporpressureofbenzeneis75torr,andthevaporpressureoftolueneis22torr.Solutionsinbothpartsofthisquestionaretobeconsideredideal.(a)Asolutionispreparedfrom1.0moleofbiphenyl,anonvolatilesolute,and49.0molesofbenzene.Calculateth

3、evaporpressureofthesolutionat20°C.(b)Asecondsolutionispreparedfrom3.0molesoftolueneand1.0moleofbenzene.Determinethevaporpressureofthissolutionandthemolefractionofbenzeneinthevapor.1972A5.00gramsampleofadrymixtureofpotassiumhydroxide,potassiumcarbonate,andpotassiumchlorideisreactedwith0.100literof2.0

4、molarHClsolution.(a)A249millilitersampleofdryCO2gas,measuredat22°Cand740torr,isobtainedfromthereaction.Whatisthepercentageofpotassiumcarbonateinthemixture?(b)TheexcessHClisfoundbytitrationtobechemicallyequivalentto86.6millilitersof1.50molarNaOH.Calculatethepercentagesofpotassiumhydroxideandofpotassi

5、umchlorideintheoriginalmixture.1973A6.19gramsampleofPCl5isplacedinanevacuated2.00literflaskandiscompletelyvaporizedat252°C.(a)Calculatethepressureintheflaskifnochemicalreactionweretooccur.(b)Actuallyat252°CthePCl5ispartiallydissociatedaccordingtothefollowingequation:PCl5(g)→PCl3(g)+Cl2(g)Theobserved

6、pressureisfoundtobe1.00atmosphere.Inviewofthisobservation,calculatethepartialpressureofPCl5andPCl3intheflaskat252°C.1976Whenthemolecularweightofavolatileliquidiscalculatedfromtheweight,volume,temperature,andpressureofasampleofthatliquidwhenvaporized,theassumptionisusuallymadethatthegasbehavesideally

7、.Infactatatemperaturenotfarabovetheboilingpointoftheliquid,thegasisnotideal.Explainhowthiswouldaffecttheresultsofthemolecularweightdetermination.®(1)APisaregisteredtrademarkoftheCollegeBoard.TheColleg