用95%和20%的乙醇制备60%乙醇150ml,需21%乙醇多少mlA.55mlB.65mlC.60mlD.70mlE.75ml
用95%和20%的乙醇制备60%乙醇150ml,需21%乙醇多少ml
A.55ml
B.65ml
C.60ml
D.70ml
E.75ml
相关考题:
用95%和45%的乙醇配制75%的乙醇溶液500ml,应取95%和45%的乙醇各多少毫升A.250ml,250mlB.200ml,300mlC.300ml,200mlD.225ml,275mlE.275ml,225ml
用95%乙醇稀释成70%乙醇时,可采用( )A.取95%乙醇70ml,加水100mlB.取95%乙醇70ml,加水25mlC.取95%乙醇70ml,加水至总体积95mlD.取95%乙醇100ml,加水70ml
用95%和45%的乙醇配制75%的乙醇溶液500ml,应取95%和45%的乙醇各A.250ml,250mlB.260ml,240mlC.300ml,200mlD.245ml,255mlE.350ml,150ml
用95%和45%的乙醇配制75%的乙醇溶液500ml,应取95%和45%的乙醇各多少体积A:250ml,250mlB:260ml,240mlC:300ml,200mlD:245ml,255mlE:350ml,150ml
用95%和45%的乙醇配制75%的乙醇溶液500ml,应取95%和45%的乙醇各A:250ml,250mlB:260ml,240mlC:300ml,200mlD:245ml,255mlE:350ml,150ml
用95%乙醇稀释成70%乙醇时,可采用()A、取95%乙醇70ml,加水100mlB、取95%乙醇70ml,加水25mlC、取95%乙醇70ml,加水至总体积95mlD、取95%乙醇100ml,加水70ml
单选题用95%和45%的乙醇配制75%的乙醇溶液500mL,应取95%和45%的乙醇各( )。A250mL,250mLB260mL,240mLC300mL,200mLD245mL,255mLE350mL,150mL
单选题配制75%乙醇溶液100ml,需95%乙醇()。A97mlB80mlC65mlD77mlE60ml