How is Avogadro s constant defined?

Hehe, I was also confused at the beginning about what this definition is all about, how did it come out of this

Actually, you can think of it this way: After the concept of atomic weight is introduced, people know the mass of a proton or neutron, or the atomic weight of an element, for example, the mass of a c atom is about 12*, and then they naturally think, how can it be related to the actual mass? The commonly used ones are 1g and 2g, so there is a difference of about 10 to the 23rd power in the middle, which is a very large number. But how much quality do you correspond to?

1g, 2g or 10g, this is the comparison Relative atomic mass, it is natural to think that 12g must be the best, so I use the number 12g 12* as a constant.

In fact, all constants are really ** when people deduce various formulas, they will finally get some constants, these constants are often the link between two important concepts, imagine pi is not, many times, people don't know what this constant is, the same for Avogadro's constant, when people defined it was the number of carbon atoms in 12g of carbon, at that time they didn't know the size of a carbon atom's mass, it was completely measured by experimental methods

I also had doubts when I read this part at the time, hehe, but then I thought about it a lot and slowly understood, I hope it can help you.

C-12 refers to carbon composed of six neutrons and six protons, which is carbon with a mass of 12. And when the molar mass is measured in g mol, it is numerically equal to the mass number of the atom.

Carbon-12 refers to a carbon atom with a mass of 12. Divide 12 grams by the mass of a carbon 12 atom and the number is equal to the value of Avogadro's constant. To put it another way, if a person doesn't know what ten is, we can tell him that ten is equal to the total number of fingers on the two hands of a normal person (not a six-fingered person).

This concept must be understood by oneself. Hope it helps.

Avogadro's constant.

Because of the Italian chemist Amodeo Avogadro.

He was the first to propose in 1811 that the volume of a gas (at a certain temperature and pressure) is proportional to the number of molecules or atoms it contains, regardless of the properties of the gas. Then Avogadro's constant.

What is it? 1. In physics and chemistry, Avogadro's constant.

Symbol: na or l) is defined as a ratio, which is the number of basic units (usually atoms or molecules) n contained in a sample, to the amount of matter it contains.

The ratio between n (in moles) is na=n n. Therefore, it is the molar mass of a particle that is linked.

i.e., the mass of 1 mole), and the proportionality constant between its masses. Avogadro's constant is used to represent the number of basic units (e.g., molecules or atoms) contained in 1 mole of matter.

2. The definition of Avogadro's constant is the number of atoms contained in kilogram c. This value is an approximation of Avogadro's constant, and there is a difference between the two. The symbol for Avogadro's constant is na, which is not a pure number.

Its unit is mol. The Avogadro constant can be measured using a variety of experimental methods.

In physics and chemistry, Avogadro's number is defined as the number of constituent particles contained in a mole of matter, which is denoted as n. Therefore, it is the ratio coefficient between the molar mass of the particle and its mass. Its values are:

Summary. In physics and chemistry, Avogadro's constant (symbol: Na or L) is defined as the number of constituent particles (usually atoms or molecules) contained in one mole of matter, denoted Na.

Therefore, it is related to the molar mass of the particle (i.e., the mass at one mole), and the proportionality coefficient between its mass. Its values are:

SI Values (2019, artificially defined): Mol Codata Recommended Values (2006, based on actual measurements): Mol What is Avogadro's constant.

Please wait. In physics and chemistry, Avogadro's constant (symbol: Na or L) is defined as the number of constituent particles (usually atoms or molecules) contained in one mole of matter, denoted Na.

Therefore, it is related to the molar mass of the particle (i.e., the mass at one mole), and the proportion between the bases of its mass family is the number of panicle factions. The values are: International System of Units (2019, Monoga-in-19 definition):

Recommended value for mol codata (2006, based on actual measurements): mol