avogadro's number

简明释义

阿佛伽德罗数

英英释义

例句

1.The concept of Avogadro's number (阿伏伽德罗常数) is fundamental to understanding molarity.

理解浓度的概念时，阿伏伽德罗常数(Avogadro's number)是基础。

2.To calculate the number of molecules in a mole, you multiply by Avogadro's number (阿伏伽德罗常数).

要计算一摩尔中的分子数，你需要乘以阿伏伽德罗常数(Avogadro's number)。

3.When working with gases, Avogadro's number (阿伏伽德罗常数) helps us determine the volume at STP.

在处理气体时，阿伏伽德罗常数(Avogadro's number)帮助我们确定在标准温度和压力下的体积。

4.In stoichiometry, Avogadro's number (阿伏伽德罗常数) allows us to convert between moles and particles.

在化学计量学中，阿伏伽德罗常数(Avogadro's number)允许我们在摩尔和粒子之间转换。

5.In chemistry class, we learned that Avogadro's number (阿伏伽德罗常数) is approximately 6.022 x 10^23.

在化学课上，我们了解到阿伏伽德罗常数(Avogadro's number)大约是6.022 x 10^23。

作文

Avogadro's number, represented as 6.022 × 10²³, is a fundamental constant in chemistry that defines the number of atoms, molecules, or particles in one mole of a substance. This concept was named after the Italian scientist Amedeo Avogadro, who was instrumental in establishing the idea that equal volumes of gases, at the same temperature and pressure, contain an equal number of molecules. Understanding Avogadro's number is crucial for students and professionals in the field of chemistry because it bridges the gap between the atomic scale and the macroscopic world we observe. In practical terms, when chemists refer to one mole of a substance, they are talking about Avogadro's number of entities—be it atoms, ions, or molecules. For instance, one mole of carbon contains approximately 6.022 × 10²³ carbon atoms. This allows scientists to quantify and compare amounts of different substances in a meaningful way. Without Avogadro's number, it would be nearly impossible to perform calculations involving chemical reactions and stoichiometry, as these calculations require precise measurements of reactants and products.In addition to its importance in chemical calculations, Avogadro's number also plays a critical role in understanding concepts such as molar mass and concentration. Molar mass, which is the mass of one mole of a substance, can be calculated using the periodic table, and knowing Avogadro's number allows chemists to convert between grams and moles easily. For example, the molar mass of water (H₂O) is approximately 18 grams per mole. Therefore, if you have 36 grams of water, you can determine that you have 2 moles of water by dividing the mass by the molar mass.Moreover, Avogadro's number is essential in gas laws, particularly the ideal gas law, which relates pressure, volume, temperature, and the number of moles of a gas. The ideal gas law is expressed as PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature. In this equation, knowing Avogadro's number helps in calculating the number of moles of gas present in a given volume under specific conditions, thus allowing for predictions about gas behavior.Furthermore, Avogadro's number has implications beyond simple chemical reactions. It is also significant in fields such as biochemistry and materials science. For instance, in biochemistry, understanding the number of molecules in a solution can help researchers determine enzyme activity and reaction rates. In materials science, knowing the atomic density of a material can influence its properties and applications.In conclusion, Avogadro's number is not just a number; it is a cornerstone of chemical education and practice. Its ability to connect the microscopic world of atoms and molecules with the macroscopic quantities we can measure makes it an invaluable tool for chemists and scientists alike. Mastering the concept of Avogadro's number allows individuals to engage more deeply with the subject of chemistry, enhancing their understanding of how matter interacts and transforms in our universe. As students continue to learn and explore the vast field of chemistry, Avogadro's number will remain a key element in their scientific toolkit, facilitating discovery and innovation in countless applications.

阿伏伽德罗常数，表示为6.022 × 10²³，是化学中的一个基本常数，它定义了在一种物质的一摩尔中所含的原子、分子或粒子的数量。这个概念是以意大利科学家阿梅德奥·阿伏伽德罗的名字命名的，他在建立等体积气体在相同温度和压力下含有相等数量的分子这一思想方面发挥了重要作用。理解阿伏伽德罗常数对学生和专业人士在化学领域至关重要，因为它弥合了原子尺度与我们观察到的宏观世界之间的差距。在实际应用中，当化学家提到一种物质的一摩尔时，他们指的是阿伏伽德罗常数的实体——无论是原子、离子还是分子。例如，一摩尔碳大约包含6.022 × 10²³个碳原子。这使得科学家能够以有意义的方式量化和比较不同物质的数量。如果没有阿伏伽德罗常数，在进行涉及化学反应和化学计量法的计算时几乎是不可能的，因为这些计算需要对反应物和产物进行精确测量。除了在化学计算中的重要性外，阿伏伽德罗常数在理解摩尔质量和浓度等概念中也起着关键作用。摩尔质量是指一摩尔物质的质量，可以使用元素周期表进行计算，而知道阿伏伽德罗常数则可以让化学家轻松地在克和摩尔之间进行转换。例如，水（H₂O）的摩尔质量约为18克每摩尔。因此，如果你有36克水，你可以通过将质量除以摩尔质量来确定你有2摩尔水。此外，阿伏伽德罗常数在气体定律中也是必不可少的，特别是理想气体定律，它将气体的压力、体积、温度和摩尔数联系起来。理想气体定律的表达式为PV = nRT，其中P是压力，V是体积，n是摩尔数，R是理想气体常数，T是温度。在这个方程中，知道阿伏伽德罗常数有助于计算在特定条件下给定体积中存在的气体摩尔数，从而允许预测气体的行为。此外，阿伏伽德罗常数在生物化学和材料科学等领域也有影响。例如，在生物化学中，了解溶液中分子的数量可以帮助研究人员确定酶活性和反应速率。在材料科学中，了解材料的原子密度可以影响其性质和应用。总之，阿伏伽德罗常数不仅仅是一个数字；它是化学教育和实践的基石。它将微观的原子和分子的世界与我们可以测量的宏观数量连接起来，使其成为化学家和科学家的宝贵工具。掌握阿伏伽德罗常数的概念使个人能够更深入地参与化学学科，增强他们对物质如何相互作用和转化的理解。随着学生继续学习和探索广阔的化学领域，阿伏伽德罗常数将始终是他们科学工具箱中的关键元素，促进无数应用中的发现和创新。