A direct consequence of Avogadro’s law is the concept of molar volume: one mole of any ideal gas at a specified temperature and 压力 occupies a fixed volume. At Standard Temperature and Pressure (STP), defined as 273.15 K (0 °C) and 1 atm, this volume is approximately 22.4 liters. This principle simplifies stoichiometry by allowing direct conversion between gas volume and moles.
摩尔体积的概念在宏观的、易于测量的体积属性与微观的、化学量的摩尔之间架起了一座强有力的桥梁。它的实用性在于它对理想气体具有普遍性；在标准条件下确定给定摩尔数所占的体积时，气体的种类变得无关紧要。这大大简化了涉及气态反应物或产物的化学反应的计算。
While the value of 22.4 L/mol is widely taught and used for STP (273.15 K and 1 atm), it’s important to note that standard conditions can vary. For instance, IUPAC now recommends a standard pressure of 100 kPa (1 bar). Under these conditions (273.15 K and 1 bar), the molar volume of an ideal gas is slightly different, approximately 22.7 L/mol. Another common standard is Standard Ambient Temperature and Pressure (SATP), defined as 298.15 K (25 °C) and 1 bar, where the molar volume is approximately 24.8 L/mol. Regardless of the specific standard used, the principle remains a direct and practical application of Avogadro’s law, fundamental to quantitative chemical analysis and process design.
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