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因為摩爾質量大; 我們可以從氣體分子來看這個問題: 對於氣體分子,摩爾質量與密度成正比,比值是一個常數,也就是說,1mol的氣體,體積是一樣的,分子量大的,那麼密度就大; 對於液體,雖然原子間距離變小,使得原子半徑需要考慮一點,但是還是無關緊要的,對於液體,基本規律還是分子量越大,那麼密度越大; 還和一些分子間作用力有關;
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