Avogadro number

简明释义

阿伏伽德罗常数;

英英释义

例句

1.The concept of the Avogadro number (阿伏伽德罗常数) helps bridge the gap between the macroscopic and microscopic worlds.

阿伏伽德罗常数（Avogadro number）的概念帮助连接宏观和微观世界。

2.In chemistry, we often refer to the Avogadro number (阿伏伽德罗常数) when calculating the number of atoms in a mole of a substance.

在化学中，我们经常提到阿伏伽德罗常数（Avogadro number），用于计算一摩尔物质中的原子数量。

3.When discussing gases, the Avogadro number (阿伏伽德罗常数) allows us to understand volumes at standard temperature and pressure.

在讨论气体时，阿伏伽德罗常数（Avogadro number）使我们能够理解在标准温度和压力下的体积。

4.The Avogadro number (阿伏伽德罗常数) is approximately 6.022 x 10²³, which is crucial for stoichiometric calculations.

阿伏伽德罗常数（Avogadro number）大约为6.022 x 10²³，对于化学计量计算至关重要。

5.To find out how many molecules are in 2 moles of water, you multiply by the Avogadro number (阿伏伽德罗常数).

要找出2摩尔水中有多少分子，您需要乘以阿伏伽德罗常数（Avogadro number）。

作文

The concept of the Avogadro number is fundamental in the field of chemistry and plays a crucial role in understanding the relationship between the microscopic world of atoms and molecules and the macroscopic world that we can observe. The Avogadro number, which is approximately 6.022 × 10²³, represents the number of atoms, ions, or molecules contained in one mole of a substance. This constant allows chemists to convert between the mass of a substance and the number of entities it contains, enabling them to perform calculations that are essential for experiments and reactions.To grasp the significance of the Avogadro number, it is important to consider what a mole is. A mole is a unit in chemistry that quantifies the amount of a substance. Just as a dozen refers to twelve items, a mole refers to approximately 6.022 × 10²³ entities. This number was named after the Italian scientist Amedeo Avogadro, who contributed significantly to the understanding of gases and their behaviors. His work laid the foundation for the concept of molecular volume and the relationships between gas quantities and their properties.One practical application of the Avogadro number is in stoichiometry, where chemists use it to balance chemical equations. For example, when calculating the amounts of reactants needed for a chemical reaction, knowing the Avogadro number allows chemists to determine how many molecules or atoms are involved. If a reaction requires two moles of hydrogen gas (H₂) and one mole of oxygen gas (O₂), using the Avogadro number, a chemist can easily calculate the total number of molecules needed for the reaction to proceed.Additionally, the Avogadro number is vital for determining the molar mass of substances. Molar mass is the mass of one mole of a substance, usually expressed in grams per mole (g/mol). By knowing the molar mass, chemists can use the Avogadro number to find out how many molecules are present in a given mass of a substance. For instance, if the molar mass of water (H₂O) is about 18 g/mol, then one mole of water contains approximately 6.022 × 10²³ molecules of water. This relationship is essential for quantitative analysis in chemistry.Moreover, the Avogadro number has implications beyond just chemical calculations. It also plays a significant role in various scientific disciplines, including physics and biology. In physics, the Avogadro number helps in understanding phenomena at the atomic level, such as the behavior of gases under different conditions. In biology, it assists in quantifying molecules like enzymes and DNA, allowing researchers to conduct experiments with precision.In conclusion, the Avogadro number is more than just a number; it is a bridge between the microscopic and macroscopic worlds. It empowers chemists to quantify reactions, analyze substances, and understand the fundamental principles of matter. As students and professionals in the field of science continue to explore the complexities of the universe, the Avogadro number remains a key concept that facilitates discovery and innovation. Understanding the Avogadro number is essential for anyone looking to delve into the world of chemistry and its applications in real life.

“阿伏伽德罗数”这一概念在化学领域中至关重要，帮助我们理解原子和分子微观世界与我们可以观察到的宏观世界之间的关系。“阿伏伽德罗数”，大约为6.022 × 10²³，表示一摩尔物质中所含的原子、离子或分子的数量。这个常数使化学家能够在物质的质量与其所含实体的数量之间进行转换，从而进行实验和反应所必需的计算。要理解“阿伏伽德罗数”的重要性，首先需要考虑什么是摩尔。摩尔是化学中量化物质的一种单位。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。这个数字以意大利科学家阿梅代奥·阿伏伽德罗的名字命名，他对气体及其行为的理解作出了重要贡献。他的工作为分子体积的概念和气体数量与其性质之间的关系奠定了基础。“阿伏伽德罗数”的一个实际应用是在化学计量学中，化学家利用它来平衡化学方程式。例如，在计算化学反应所需的反应物时，知道“阿伏伽德罗数”可以让化学家确定参与的分子或原子的数量。如果一个反应需要两摩尔氢气（H₂）和一摩尔氧气（O₂），通过使用“阿伏伽德罗数”，化学家可以轻松计算出反应所需的总分子数。此外，“阿伏伽德罗数”对于确定物质的摩尔质量至关重要。摩尔质量是指一摩尔物质的质量，通常以克每摩尔（g/mol）表示。通过知道摩尔质量，化学家可以利用“阿伏伽德罗数”来找出给定质量的物质中存在多少分子。例如，如果水（H₂O）的摩尔质量约为18 g/mol，那么一摩尔水中大约包含6.022 × 10²³个水分子。这种关系对于化学中的定量分析至关重要。此外，“阿伏伽德罗数”在多个科学学科中都有深远的影响，包括物理学和生物学。在物理学中，“阿伏伽德罗数”有助于理解原子层面上的现象，例如气体在不同条件下的行为。在生物学中，它有助于定量酶和DNA等分子，使研究人员能够精确地进行实验。总之，“阿伏伽德罗数”不仅仅是一个数字；它是微观与宏观世界之间的桥梁。它使化学家能够量化反应、分析物质，并理解物质的基本原理。随着学生和专业人士继续探索宇宙的复杂性，“阿伏伽德罗数”仍然是促进发现和创新的关键概念。理解“阿伏伽德罗数”对于任何希望深入化学及其现实生活应用的人来说都是必不可少的。