The concept of high school chemistry molars, the definition of chemistry moles in high school

A hydrogen molecule contains 2 hydrogen atoms.

A hydrogen molecule is 1 mol of hydrogen molecule, or a hydrogen molecule containing 1 mol of hydrogen.

Mole, abbreviated as mole, formerly known as gram molecule and gram atom, is one of the seven basic units of the International System of Units, indicating the amount of matter, and the symbol is mol. Every 1 mole of any substance (microscopic substance, such as molecules, atoms, etc.) contains Avogadro's constant (about a particle. When molar is used, elementary particles should be specified and may be atoms, molecules, ions and other particles, or a specific combination of these particles.

Moore definition. When using moles, elementary particles should be specified, which can be atoms, molecules, ions, clusters of atoms, electrons, protons, neutrons and other particles, or a specific combination of these particles. Internationally, it is stipulated that the number of particles contained in a 1mol particle collective is the same.

The number of carbon atoms contained in c(carbon-12) is the same, i.e., the number of structural particles contained in one mole of any substance is equal to.

The number of atoms contained in c(carbon-12), ie.

structural particles. Sometimes, the mass of one mole of a substance is referred to as the molar mass of the substance, which is denoted by the symbol m. Such as m= of hydrogen H2

The amount of a substance (also known as the number of moles) of a substance whose mass f is m, and the ratio of m to m is called the substance, = m. For example, m = hydrogen. h₂

The number of moles = 2. The volume occupied by one mole of substance.

VM, known as the molar volume. The molar volume of a gas depends on temperature and pressure. In the standard state, the ideal gas.

vm=。The molar volume of solid and liquid substances has less to do with temperature and pressure. The volume of one mole of different solid substances and different liquid substances is different.

According to the precise determination of scientific experiments, it is known that a carbon atom c (carbon-12) contains about the number of c.

A mole is a unit of quantity (n) of a substance, and the symbol is mol; Molar mass (m) refers to the mass possessed by a substance in the amount of a unit substance; The relationship between mass (m), molar mass (m), and quantity of matter (n) is: n=m m=n na, so it gets: m m=n na

There is a molar volume in terms of gas, there are more questions in this place, and there are many traps, so you should pay more attention to the questions in the future: the molar volume of gas: the gas accounted for by the amount of gas per unit of substance.

In particular, there is a special concept, the molar volume of the gas under the standard condition (refers to the volume occupied by 1mol of any gas under the standard condition, and the following points should be considered first when this problem arises: 1. It must be under the standard condition 2. It must be a gas to adapt (especially note that the question is willing to say that the volume of the liquid under the standard condition is, which is wrong).

In fact, when I first learned this part, I may feel that the content is quite miscellaneous and messy, but the type of questions in this part is just a few concepts, which are fixed, and I feel that there are several questions, and I can summarize and summarize it, come on...

To be honest, I studied chemistry, and I didn't understand it when I was in high school, and I always went around it. But, as long as you make him a unit like "one".

The unit of the amount of a substance is mol. The quantity of matter is a physical quantity that represents a collection containing a certain number of particles.

mol can be understood because there are too many microscopic particles, for the convenience of elaboration, it will be regarded as a unit, you can see it as 1, when you look at it, it is best to summarize it with the name of the physical quantity, the unit of the physical quantity, and the meaning of the physical quantity, and then it will not be mixed.

The amount of matter of K2S04 n==

k2s04==2k+ +so42-

x yx==， y==

There are potassium ions and sulfate in the solution, and the sum of the two is, and the solvent water can also be weakly ionized to produce hydrogen ions and hydroxide, so the total number of anions and cations in the solution must be greater than one.

SO42-ion is an anion, which is resistant to acid dust.

1. m=nm=100 18=1800g There are 100na, which is one.

2. m=nm= There is a simple hall, which is one.

3. n=m m=90 18=5mol, there are 5na, that is.

4. n=m m=56 28=2mol, there are 2na blocks, which is a sedan chair.

NaOH + HCl == Ratio of the amount of NaCl + H2O species = 1:1:1:1

Fe2O3 + 3Co == (High Temperature) == Ratio of the amount of 2Fe + 3CO2 matter = 1:3:2:3

2kclo3 ==(heating, mNO2)== 2kCl + 3O2(gas) The ratio of the quantities of matter = 2:2:3

2H2O2 ==(MNO2)== 2H2O + O2(Gas) The ratio of the amount of matter = 2:2:1

1.Use m,v to denote the amount of concentration of the solution substance c=n v=m (mv)*1000 (mol l).

2.W,p is used to denote the amount concentration of the solution substance c=1000*p*w% m (mol l).

3.C,P is used to denote the mass fraction of the solution w%=cm (1000C)4The solubility of NaCl at this temperature is expressed by W s=100W (100+W) (g).

Note: M is the molar mass of NaCl.

Concentrated H2SO4) * V * V (Concentrated H2SO4) = C (dilute H2SO4) (dilute H2SO4).

Concentrated H2SO4) * M (concentrated H2SO4) * V (H2SO4 concentration) = C (dilute H2SO4) * V (dilute H2SO4).

It's nice to have this)

2。Several volumetric flasks 1005001000

m = mn = cvm = 2 * 1 * (23 + g3 mass SO2 and O2 molecules are equivalent when the mass ratio of matter = 1:2,? Number of atoms = number of molecules = 1 * mark * 3:

2 * 2 = 3:4？The number of molecules of oxygen is the atomic ratio = * oxygen subscript = 1 * 2.02 * 2 = 1:

2 Oxygen atomic Mass = Atomic Number Ratio of Oxygen * m = 1:2

Avogadro's constant, as I remembered it at the beginning: a multiple is equivalent to 1 dozen eggs with 12 eggs, and 2 dozen eggs with 24; A mole of atoms is an atom. It's easy to understand when you get used to it

n = n small a n

n small a is Avogadro's constant.

n is the amount of matter.

n is the number of particles.

The quantity of matter is in a certain proportion to the mass of the substance we actually come into contact with, because matter is made up of particles, and mass is used to measure the amount of matter, so the quantity of particles is measured by the quantity of matter, and the molar mass used to connect them. If there are two Na+ in a Na2R molecule, then all Na+ constitute the Na2R molecule, and the molecule is naturally only.