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
2023-06-30
A.250ml,250ml
B.260ml,240ml
C.300ml,200ml
D.245ml,255ml
E.350ml,150ml
参考答案:C
B.260ml,240ml
C.300ml,200ml
D.245ml,255ml
E.350ml,150ml
参考答案:C
应取95%乙醇的体积为:(75%×500-45%×500)/(95%-45%)=300ml,应取45%乙醇的体积为200ml。
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