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( 安徽省阜阳一中 2019 届模拟)利用油膜法可以粗略的测出加德罗常数,把密度 ρ = 0.8×10 3 kg/m 3 的某种油,用滴管滴出一滴油在水面上形成油膜,已知这滴油的体积为 V = 0.5×10 - 3 cm 3 ,形成的油膜面积为 S = 0.7 m 2 ,油的摩尔质量为 M 0 = 0.09 kg /mol. 若把油膜看成是单分子层,每个油分子看成球形,那么: (1) 油分子的直径是多少? (2) 由以上数据可以粗略地测出加德罗常数 N A 是多少?先列出文字计算式,再代入计算,只要求保留一位有效数字.
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