Whether the molar volume of a substance is certain or not, and how to calculate the molar volume of

Do you see the pattern? The molar mass of Mg is 24g mol, while the relative atomic mass of Mg is also 24

The molar mass of KCl is and so is the relative molecular mass of KCl.

If you think about the definition of mol, it is a long, long time ago, a chemist thought that it was inconvenient to use mass to represent chemical substances, so he put n molecules (or atoms) together to study, and the value of n is fixed, yes, and the mass of each substance molecule (or atom) is exactly the molecular weight (or atomic weight) of this substance. Of course, this is not a casual statement, it has been researched very precisely.

If you don't understand what I said above, then you should remember a rule: the molar mass of a substance = the molecular weight (or atomic weight) of the substance, but the unit is different, the unit of molar mass is g mol, and the molecular weight and atomic weight have no unit. If there is a judgment question that says, "The molar mass of such and such a substance is .......""Then don't panic to calculate the molecular weight, you must pay attention to the unit, generally this kind of problem is in the unit problem, the data will not be wrong.

It's been a long time since I've studied chemistry, and it's not very professional or right, so I hope it can help you, hehe.

Gases have a molar volume. Affected by temperature pressure.

m（kcl）＝39+

The relative atomic masses are added together.

m (mass) = p (density) v (volume).

m(mass) = g(gravity) g(

For example, the length, width and height of a rectangular lead block, and the density of the table is checked, then the mass is m=

m refers to mass in grams (g); p is the density, in grams per cubic meter (g cm); v is the volume in cubic meters (cm).

The mass possessed by a substance as a unit of substance is called molar mass, which is denoted by the symbol m. When the quantity of a substance is measured in mol, the unit of molar mass is g mol, which is numerically equal to the atomic mass or molecular mass of the substance.

For a compound, its molar mass is fixed. The mass of a substance changes with the amount of matter.

The mass possessed by a substance as a unit of substance is called molar mass, which is denoted by the symbol m. When the mass of a substance is measured in grams, it is numerically equal to the relative atomic mass or relative molecular mass of the substance.

The molar mass of common substances is detailed below:1. The molar mass of hydrogen H is: 1.

2. The molar mass of helium is 4.

3. The molar mass of lithium Li: 7.

4. The molar mass of beryllium BE is: 9.

5. The molar mass of boron b is: 11.

6. The molar mass of carbon c is: 12.

7. The molar mass of nitrogen N is: 14.

8. The molar mass of oxygen O is: 16.

9. The molar mass of fluorine F is: 19.

10. The molar mass of neon is 20.

11. The molar mass of sodium Na is: 23.

12. The molar mass of magnesium mg is: 24.

13. The molar mass of aluminum AL is: 27.

14. The molar mass of silicon is 28.

15. The molar mass of phosphorus p is: 31.

16. The molar mass of sulfur S is: 32.

17. The molar mass of chloroc Cl is: .

18. The molar mass of argon is: 40.

19. The molar mass of potassium K is: 39.

20. The molar mass of calcium Ca is: 40.

21. The molar mass of scandium sc is: 45.

22. The molar mass of titanium Ti is: 48.

23. The molar mass of vanadium V is: 51.

24. The molar mass of chromium CR is: 52.

25. The molar mass of manganese mn is: 55.

26. The molar mass of Fe iron is: 56.

27. The molar mass of cobalt cobalt is: 59.

28. The quality of nickel Ni is: 59.

29. The molar mass of copper Cu is: 64.

30. The molar mass of zinc Zn is: 65.

Molar volume, trace type refers to the volume of a certain substance per unit of substance, that is, the volume of one mole of substance, the number of structural particles contained in 1 mole of any substance is, and the mass of 1 mole of substance is called molar mass.

1 mole of atoms, whose mass is numerically equal to its atomic weight (equivalent to the gram atomic weight in the old unit) if measured in grams; A molecule of 1 mole has a mass in grams, which is numerically equal to its molecular weight (equivalent to the gram in the old unit).

Knowing the volume and molar mass of a gas, the formula for calculating the quantity of a substance is as follows:

The amount of the solute = the amount of the trace substance of the solute, the concentration x the body of the solution, the tolerance of the solution n = cv.

Quantity of matter = number of particles Avogadro's constant (n=n na); Quantity of matter = mass of matter Molar mass of matter (n=m m); The amount of matter = the volume of the gas The molar volume of the gas (n=v vm).

The quantity of matter: The quantity of matter is one of the 7 basic physical quantities in the International System of Units (the 7 basic physical quantities are: length, mass, time, current intensity, luminous intensity, temperature, and the quantity of matter), and it is the same as the concepts of "length", "mass", "time", etc., it is a physical quantity of the overall noun.

Its symbol is n, and the unit is mole (mol), which is referred to as mole. The quantity of a substance is the ratio of the number of particles (n) (e.g., molecules, atoms, etc.) contained in a substance to 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. <>

Molar mass is the mass of a substance divided by the amount of matter in grams per mole, and molar volume is the volume of a substance divided by the amount of matter in cubic meters per mole.

1mol is measured in Avogadro number, which is a batch, not a number to measure the number of molecules, atoms and other particles. It can also be used to measure specific combinations of microscopic particles.

For example, the amount of sulfuric acid measured in moles, i.e. 1 mol of sulfuric acid contains one sulfuric acid molecule. Molar is the most widely used unit of measurement in chemistry, such as the calculation of chemical reaction equations, calculations in solutions, preparation and dilution of solutions, calculations of chemical equilibrium, gas molar volume and thermochemistry are inseparable from this basic unit.

There are many ways. Look at what the conditions are given.

The simplest way is to know the chemical formula, and use the relative atomic mass to find the relative molecular mass such as: CO2, the relative molecular mass = 12 + 16 * 2 = 44 The molar mass of carbon dioxide is 44g mol

The formula for calculating molar mass.

1) The quantity concentration of a substance is the number of moles of a substance per unit volume, formula: c=n v, unit: mol l

2) The molar volume of a gas is the volume of 1 mole of gas in a standard condition (the definition of a standard condition: a temperature of 0 degrees Celsius, a standard atmosphere).The molar volume of all gases in standard conditions is.

3) Molar mass is the mass of 1 mole of a substance, which is numerically equal to its relative molecular mass, e.g. the molar mass of O2 is 32g mol

The value of the molar mass is the same as the relative molecular (atomic) mass of the substance.

For example, the relative molecular mass of water is 18 and the molar mass is 18 g mol

Then, according to the formula n=m, m can be deduced m (molar mass) = m (mass of the substance) n (quantity of the substance).

m (molar mass) = m (mass of the substance) n (quantity of the substance).

When the mass of a substance is measured in grams, the molar mass is numerically equal to the relative atomic mass or relative molecular mass of the substance.

Density = Volume mass.

Molar mass = mass relative molecular mass.

After the United Force. Density = volume molar mass * relative molecular mass.