Simple questions about high school chemistry! Moore . Thank!

Moore: The quantity of matter is a physical quantity, representing a certain number of particles, and the symbol is n unit is mole, referred to as mole.

Mole is a unit of quantity that represents matter, it is a heap quantity, (a pile of two piles) A mole of particles containing a particle (particles: atoms, molecules, ions, atomic clusters, electrons, protons, neutrons, etc.) is not what you call "mass units, quantitative units".

The quantity of matter is one of the 7 basic physical quantities in the SI system, and it is a physical quantity as a whole noun, just like the concepts of "length", "mass", "time", etc. Its symbol is n, and the unit is mole, which is referred to as mole. The amount of a substance is the ratio of the number of particles (n) contained in the substance to the Avogadro's constant (na), i.e., n=n na.

It is a physical quantity that connects microscopic particles with macroscopic weighable matter.

It indicates the number of particles contained in a substance.

Molecules, atoms, ions, protons, electrons, etc.

The unit of the amount of matter is mole (mol).

Symbol: mol

Standard: The number of carbon atoms contained in kg 12c.

When using the amount of substance, the basic unit must be indicated. Generally, chemical formulas are used to indicate the basic units, rather than Chinese characters. When molars are used, the basic unit should be indicated and can be an atomic molecule and its particles, or a specific combination of these particles.

2. Avogadro's constant (NA).

In simple terms, a mole is a quantitative unit of quantity.

1 mole represents a number of chemical particles (used for chemical particles such as ionic molecules) is also called Avogadro's constant.

1 mole of H2O represents a water molecule.

2 moles of Na+ means 2* Na+

Got it?

Mole is a unit of quantity of matter, just as the kilogram is a unit of mass.

The quantity of matter is an international unit like velocity, mass, etc., a collective noun, which cannot be understood as the mass of matter or the quantity of matter, it is a collective, which means a collective containing a certain number of particles, including molecules, atoms, ions, protons, electrons, neutrons and other microscopic ions, for macroscopic matter can not use moles, can not say 1mol table, that is to say, moles this unit is only applicable to microscopic particles.

Mole – the amount of matter.

In layman's terms, it is the number of particles such as ions and electrons.

Like a unit of quantity.

Actually, this content is very easy to understand.

All you have to do is memorize those formulas.

I don't think there's anything special about it, if there's a problem, you give me an example, and I'll tell you about it.

A is Na, B is Cl2, C is H2, D is NaCl, E is H2O, and F is Naoh

Reaction 1: 2Na + Cl2 = (ignition) = 2NaCl Reaction 3: 2H2O + 2Na = 2NaOH + H2 Reaction 4: 2NaCl + 2H2O = (electrolysis) = 2NaOH + H2 + Cl2

The molar mass is respectively , and the unit is g mol. The quantity of a substance is equal to the mass divided by the molar mass, and the volume and number of molecules are proportional to the quantity of the substance. So the order is:

Molar mass: O2>N2> H2, quantity, volume, number of molecules: H2>N2>O2.

When heated, NaOH + NaHCO3 = Na2CO3 + H2O [no CO2 release] occurs first, and then 2NaHCO3 = Na2CO3 + H2O + CO2.

Because v1 is not equal to 0, it means that the above two reactions have occurred and are completed, so the composition of the solid residue is only sodium carbonate;

Assuming v1=22,4L, it means that the sodium bicarbonate participating in reaction 2 is 2mol, that is to say, sodium bicarbonate is 2mol more than sodium hydroxide [the sodium carbonate generated by reaction 2 is 1mol]; Then v2 =, indicating that the sodium carbon generated after heating is 2mol, [indicating that the sodium carbonate generated in reaction 1 is also 1mol], so that the sodium bicarbonate participating in reaction 1 is 1mol, and the sodium hydroxide is also 1mol, so the ratio of the amount of mol in the leakage field of NaOH and NaHCO3 in the original mixture is 1:3.

The amount of oxygen atom corresponding to x2o5 matter is, the molar mass is, the atomic weight of x = (108-5*16) 2=14, I support you!