avogadro's number

简明释义

阿伏加德罗数

英英释义

例句

1.In chemistry, we often use Avogadro's number (阿伏伽德罗常数) to convert between moles and molecules.

在化学中，我们经常使用阿伏伽德罗常数 (Avogadro's number) 来在摩尔和分子之间进行转换。

2.One mole of any substance contains Avogadro's number (阿伏伽德罗常数) of particles.

任何物质的一摩尔包含阿伏伽德罗常数 (Avogadro's number) 个粒子。

3.When calculating molar mass, knowing Avogadro's number (阿伏伽德罗常数) is essential.

在计算摩尔质量时，了解阿伏伽德罗常数 (Avogadro's number) 是必不可少的。

4.To find the number of atoms in a sample, you can multiply the number of moles by Avogadro's number (阿伏伽德罗常数).

要找到样品中的原子数量，可以将摩尔数乘以阿伏伽德罗常数 (Avogadro's number)。

5.The value of Avogadro's number (阿伏伽德罗常数) is approximately 6.022 x 10²³.

在化学中，阿伏伽德罗常数 (Avogadro's number) 的值大约是 6.022 x 10²³。

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. Understanding Avogadro's number is crucial for students and professionals in the field of chemistry because it serves as a bridge between the atomic scale and the macroscopic scale, allowing chemists to quantify and compare amounts of substances in a meaningful way.To grasp the significance of Avogadro's number, it's important to first understand the concept of a mole. A mole is a unit of measurement used in chemistry to express amounts of a chemical substance. Just as a dozen refers to twelve items, a mole refers to approximately 6.022 × 10²³ entities, whether they are atoms, molecules, or ions. This allows chemists to work with large quantities of tiny particles in a manageable way.For example, if we have one mole of carbon atoms, we have Avogadro's number of carbon atoms, which is about 12 grams of carbon. This relationship is incredibly useful because it allows chemists to convert between grams and moles easily, facilitating calculations in chemical reactions and stoichiometry. When performing experiments, knowing how many molecules are involved can help predict how substances will interact and react with each other.The historical context of Avogadro's number also adds to its importance. The Italian scientist Amedeo Avogadro proposed that equal volumes of gases, at the same temperature and pressure, contain an equal number of molecules. This idea laid the groundwork for determining the number of particles in a given amount of substance, leading to the establishment of Avogadro's number as a universal constant.In practical applications, Avogadro's number is essential in fields such as pharmaceuticals, materials science, and environmental science. For instance, when developing new medications, scientists must calculate the precise amounts of active ingredients needed to ensure efficacy and safety. By using Avogadro's number, they can determine how many molecules of a drug are required to achieve the desired therapeutic effect.Moreover, understanding Avogadro's number is vital for comprehending concepts like molarity and concentration in solutions. Molarity, defined as the number of moles of solute per liter of solution, relies on this constant to express concentrations accurately. This is particularly important in laboratory settings where precise measurements are necessary for successful experiments.In conclusion, Avogadro's number is not just a numerical value; it is a key concept that connects the microscopic world of atoms and molecules with the macroscopic world we observe. Its role in chemistry is indispensable, enabling scientists to perform calculations that lead to discoveries and innovations. By mastering the concept of Avogadro's number, students and professionals alike can enhance their understanding of chemical principles and their applications in real-world scenarios.

阿伏伽德罗常数，用6.022 × 10²³表示，是化学中的一个基本常数，定义了一个摩尔物质中原子、分子或粒子的数量。理解阿伏伽德罗常数对化学领域的学生和专业人士至关重要，因为它在原子尺度和宏观尺度之间架起了一座桥梁，使化学家能够以有意义的方式量化和比较物质的数量。要理解阿伏伽德罗常数的重要性，首先需要了解摩尔的概念。摩尔是化学中用来表示化学物质数量的测量单位。就像“打”指的是十二个物品一样，摩尔指的是大约6.022 × 10²³个实体，无论是原子、分子还是离子。这使得化学家能够以可管理的方式处理大量微小粒子。例如，如果我们有一摩尔碳原子，我们就有阿伏伽德罗常数个碳原子，约为12克碳。这种关系非常有用，因为它使得化学家可以轻松地在克和摩尔之间转换，从而促进化学反应和化学计量学中的计算。在进行实验时，知道涉及多少分子可以帮助预测物质之间的相互作用和反应。阿伏伽德罗常数的历史背景也增加了它的重要性。意大利科学家阿梅迪奥·阿伏伽德罗提出，在相同温度和压力下，等体积的气体含有相等数量的分子。这一观点为确定给定物质中粒子的数量奠定了基础，导致阿伏伽德罗常数作为一个普遍常数的建立。在实际应用中，阿伏伽德罗常数在制药、材料科学和环境科学等领域至关重要。例如，在开发新药时，科学家必须计算所需的活性成分的精确数量，以确保疗效和安全性。通过使用阿伏伽德罗常数，他们可以确定达到所需治疗效果所需的药物分子数量。此外，理解阿伏伽德罗常数对于理解溶液中的摩尔浓度和浓度等概念至关重要。摩尔浓度被定义为每升溶液中溶质的摩尔数，这依赖于这个常数来准确表达浓度。这在实验室环境中尤其重要，因为精确的测量对于成功的实验至关重要。总之，阿伏伽德罗常数不仅仅是一个数值；它是一个关键概念，将原子和分子的微观世界与我们观察到的宏观世界连接起来。它在化学中的作用不可或缺，使科学家能够进行计算，从而导致发现和创新。通过掌握阿伏伽德罗常数的概念，学生和专业人士都可以增强对化学原理及其在现实世界中的应用的理解。