立方厘米中含有3.35x10的22次方个水分子,一滴水的体积约为20立方毫米它里面含有多少个水分子?如果让一微生物喝完这滴水,假设每秒喝进1X10的6次方个水分子,需要多长时间能喝完这滴水?
人气：177 ℃ 时间：2019-09-01 05:00:08
解答
ρ水＝1g/cm³
因此1cm³水的质量
M＝ρ水V＝1g
所以每个水分子的质量
m＝M/3.35×10^22≈2.985×10^－22g
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