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1.2MoleandtheAvogadroconstant1.Howmanyofatomsarecontainedin5.6gofiron?2.Howmanyironaretherein0.1moleiron?3.Howmanyof12×1023moleculesofH2?4.Howmanyaretherein2molesH2?5.Calculatetheof0.2moleofgasats.t.p.6.Calculatetheof13.44dm3ofgasats.t.p.(1)arepresent?(2)arepresent?(3)arepresent?(4)arepresent?(5)Writedownabalancedequationforthecombustion.(6)wereproducedinthecombustion?(7)Whatofthewasproduced?(8)wereusedup?(a)UsethevalueoftheAvogadroconstanttocalculatethetotalnumberofatomsin7.10gofchlorineatoms.(b)Calculatetheamountinmolesofnitricacid,HNO3,in25cm3ofa0.1moldm-3aqueoussolution.(c)Calculatetheconcentrationinmoldm-3ofsodiumhydroxide,NaOH,if250cm3ofasolutioncontains2.0gofNaOH.(d)Whatistheconcentrationinmoldm-3ofanaqueoussolutioncontaining4.00gdm-3ofsodiumhydroxide,NaOH?(e)Calculatethevolume,indm3,occupiedby26.4gofcarbondioxideatroomtemperatureandpressure.Giventhatatroomtemperatureandpressure,1moleofanygasoccupiesavolumeof24dm3.Whichofthesesampleshasthelargestmass?A.2.24dm3ofethane,C2H6.B.3.6×1022moleculesofO2.C.672cm3ofcarbondioxideCO2.D.0.05moleofhydrogenfluoride,HF.1.Anorganiccompoundhasthefollowingpercentagecompositionbymass:40％ofcarbon,53.33％ofoxygenand6.67％ofhydrogen.Therelativemolecularmassofthecompoundis180.Findtheempiricalformulaandthemolecularformulaofthecompound.1.Howmanyatomsarepresentin8.8gofcarbondioxide,CO2?2.Calculatethenumberofatomsof8gmethane,CH4.3.Calculatethenumberofatomsof15.6gofbenzene,C6H6.4.Calculatethenumberofatomsof21.8gofbromoethane,C2H5Br.