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有一浓度很稀的表面活性剂水溶液,在298K时用快速移动的刀片刮取溶液表面,测得表面活性剂的表面过剩量Γ=3.0×

10-6mol·m-2。已知298K时纯水的表面张力为0.072N·m-1,求该表面活性剂水溶液的表面张力。

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