用95%和20%的乙醇制备60%乙醇150ml,需20%乙醇多少A.50mlB.60mlC.65mlD.70mlE.75ml
用95%和20%的乙醇制备60%乙醇150ml,需20%乙醇多少
A.50ml
B.60ml
C.65ml
D.70ml
E.75ml
B.60ml
C.65ml
D.70ml
E.75ml
参考解析
解析:(95%×150-60%×150)/(95%-20%)=70ml。
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