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SAT2化学知识点详解 Density of Gases.

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  SAT2化学是SAT2众多科目中的一种,美国很多很好的学校都至少要求两门SAT2的成绩,所以我们大多数赴美留学的同学还是义无反顾地选择了参加这个考试。今天我们主要是谈一下SAT2化学知识点Density of Gases。

  Since gases are mostly empty space, the densities of gases are reported in g/L, not g/mL as found for solids and liquids. As you’re probably aware, density is equal to mass per unit of volume. To calculate the density of a gas at standard temperature and pressure, you take the molecular formula weight of the gas (grams per mole—from the periodic table) and divide that by the standard molar volume for a gas, which is 22.4 L per mole:

  

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