高中化学计算题(一).doc

高中化学计算题(一).doc:..高中化学计算题(一)putationalproblems,theamountofreactants,reactionchemicalequationsaredifferent,suchascarbondioxidegasesintotheNaOHsolution,essamount,therearetwoequationsC02+Na0H=NaHC03,C02+2Na0H=Na2C03+H20Whenweencountersuchaproblem,wecanusethetwoyuanequationsettosolvetheproblem,andsetlipthecarbondioxidexmolofsodiumbicarbonatetoproducethecarbondioxideymolofsodiumbicarbonateConservationlawscanbeappliedNamely,conservationofcarbonatomsandconservationofsodiumionsSolvingproblemsofchemicalcalculationproblemsThechemicalcalculationproblemisakindofproblemstudentsheadacheinchemistrylearning,akindoftopicintheirtestsandexamsinthemostdifficulttoscore,uratelysolvethecalculationproblems,toimprovelearning,reinforcementlearningefficiency,isofgreatsignificance・Choosetheappropriatemethodtosolvethecalculationproblems,cannotonlyshortenthesolvingtime,plexityintheprocess,toreducetheerrorintheprocessofoperationopportunityasmuchaspossible・Forexample,therearetwokindsofdifferentmethods,incontrast,isnotdifficulttoseetheimportanceofselectingtheappropriatemethod:_l],whenthecopperafterallthereaction,(・P),//LSolution1:becausethesubjectdoesnotindicatethatnitricacidisconcentratedordilute,theproductcannotbedetermined,accordingtothetwoequationsforthereactionofcopperwithnitricacid:(1)3Cu+8HN03(rare)=3Cu(N03)2+2N0二+4H20(2)Cu+4HN03(strong)二Cu(N03)2+2N02二+2H20,canbesetinthereaction(1)Cuxmol,NOgasgeneratedbythereactionof2/3xmol,theconsumptionofnitricacidreactionfor8/3xmol,andthensetupinresponse(2Cu)ymol,N02gasgeneratedbythereactionof2ymol,theconsumptionofnitricacidreactionis4ymol,andtheequationsarelisted:(x+y)*64=,[(2/3)x+2y]*=,obtainx=,y=0・035mol,thentheconsumednitricacidis8/3x+,itsconcentrationis()mol/L,between8~9,