What is the relationship between the relative molecular mass and stoichiometric number

In a single molecule, the relative molecular mass.

It has nothing to do with stoichiometric numbers.

In a chemical reaction, in order to facilitate the calculation, the molecule of the reaction is regarded as the overall calculated mass, then, the mass at this time is the relative molecular mass multiplied by the stoichiometric number.

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Relative molecular mass is an intrinsic property of a molecule that is the same in different chemical equations and does not change.

Stoichiometric refers to the coefficient in front of a molecule in a chemical equation, which is generally different in different chemical equations.

For example: 2NaOH + CO2 = Na2CO3 + H2ONAOH + CO2 = NaHCO3

In both of the above chemical equations, the relative molecular mass of NaOH is 40, but in the first one, the stoichiometric number of NaOH is 2 and in the second it is 1. When using NAOH calculations, the first one should be 80 and the second one 40.

Relative molecular mass = stoichiometric number The relative mass of a molecule.

For example, the relative molecular weight of 5Fe=56 5=280

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Relative molecular mass is practically independent of stoichiometry.

However, in the chemical reaction equation, the relative molecular mass needs to be multiplied by the stoichiometric number to obtain the unit mass that actually participates in the reaction.

The relationship between relative atomic mass, number of protons, number of neutrons.

For example, if the mass ratio of two reactants is 3 to 4 and the relative molecular mass ratio is 3 to 8, you should think that the mass is 3g and 4g, and the relative molecular mass is 3 and 8, and use 3 3

4 8 = 2:1 This is the ratio of stoichiometric numbers.

The relationship between relative atomic mass, number of protons, number of neutrons.

This is chemically prescribed, according to the concept of the amount of matter, that is, 12 g) of carbon-12 atoms as the standard, i.e. 12 g

The amount of carbon is 1 mol, according to the concept of molar mass, the mass of the substance of the amount of elemental matter is called molar mass, i.e. the mass of 1 mole of carbon is 12g, and the molar mass of carbon is 12g mol, i.e. 12 is exactly the relative atomic mass of carbon-12, so the molar mass is numerically equal to the relative atomic mass. So, the relative molecular or atomic mass of a substance is equal to the mass of the substance. For other atoms, the ratio of the mass of an atom to the 1 12 of the carbon-12 atom is the relative atomic mass, that is, the ratio of the relative atomic mass of the atom is equal to the relative atomic mass, so the ratio of the relative molecular mass of the substance is equal to the ratio of the mass of the substance.

1.Formula weight and relative molecular mass.

The difference is that the definition is different.

2.In the chemical source book, the relative quantity refers to the atomic weight of each atom in the experimental formula of matter.

The sum of the total. 3.Relative molecular mass refers to the relative atomic mass of each atom in the chemical formula.

ar), denoted by the symbol mr, in units of 1.

4.In the case of polymers, their relative molecular weight.

It can reach tens of thousands or even hundreds of thousands.

5.The chemical formula of the oxide with the smallest relative molecular mass is h?o。

6.Relative molecular mass (RelativeMolecularmass) is the sum of the relative atomic masses (Ar) of each atom in the chemical formula, represented by the symbol MR, in units of 1. Hail jujube macro.

7.For polymers, their relative molecular weights can reach tens or even hundreds of thousands.

8.The chemical formula of the oxide with the smallest relative molecular mass is h?o。

The relative molecular mass is obtained by adding the relative masses of all the atoms in the molecular formula, such as CO2, carbon is 12, oxygen is 16, then the equivalent molecular mass of carbon dioxide molecule is 12 16 2 44

If the relative mass of an atom is set to m grams, then the atomic mass in the relative accusation is a ratio of m to the mass of a carbon 12 (carbon 12 is a type of carbon atom).

No. The mass measurement of atoms is the same as the mass measurement of molecules, and there are three quantity names in succession: relative molecular mass, rolling carrier mass and molecular weight. It is well known that the mass of a molecule is the sum of the masses of the atoms that make up the molecule.

In daily professional work, the molecular mass of both elemental and compound compounds is calculated based on the number of atoms of each element and the "relative atomic mass" of each element (found on the periodic table). Since the relative atomic mass of an element is a relative mass of a unit of "1", then the molecular mass calculated from this must also be a relative mass of a unit of "1". For some biological macromolecules with complex structures, their approximate molecular mass is often measured by electrophoresis, centrifugation or chromatography, so it is a relative concept.

Therefore, the "molecular weight" that we have been accustomed to using for a long time is actually a relative molecular mass.

Thus, the national standard states that "previously known as molecular weight" is the "relative molecular mass" (relativemolecularmass) and defines the latter as "the ratio of the average mass of a molecule or specific unit of a substance to the atomic mass of nuclide 12c 1 12".The relative molecular mass is the ratio of the two masses, and the meaning of "relative" is further clarified in the form of computational expression. For the definition of "specific unit", it mainly refers to a special mixed large substance whose composition such as air is basically unchanged, and their relative mass can be calculated according to the relative molecular mass of their constituent parts (N2, O2, CO2, Ar, etc.) and their volume fraction in air, which can then be obtained by comparing it with 1 12 of the atomic mass of 12C.

The quantity symbol for the relative molecular mass is mrin "1".

The so-called stoichiometric number is generally referred to as the coefficient in the chemical equation, and in high school chemistry, it often refers to the amount of matter.

How much is it, 2H2+O2=2H2O It can be said that its stoichiometric numbers are ., respectively

Relative molecular weight.

For example, the relative molecular mass of oxygen to hydrogen is 32:2=16, which is mainly used in calculations.

Mass fraction: It is generally calculated in two ways: 1. The amount of chemical formula is used.

Calculate, e.g. calculate the mass fraction of hydrogen in H2O 2 18*100%=11%. 2. Give specific substances and calculations, for example, calculate that 100g of mixture has sodium chloride.

20g to find the mass fraction of sodium chloride 20 100*100%=20%.

I don't know if it's clear or not, because what you said is more general, so I can only say it like this, taking 2h2+02=2h2o as an example.

Stoichiometric numbers refer to the "2" in front of hydrogen, the "1" in front of oxygen, and the "2" in front of water

What he means is that 2 hydrogen molecules react with 1 oxygen molecule to form 2 water molecules.

Stoichiometry indicates the ratio of a chemical reaction.

Relative molecular mass: First of all, you need to specify the relative atomic mass.

Because molecules are made up of atoms. There is ** at the back of the relative atomic mass book, check it yourself, take H2O as an example, the relative molecular mass = 2 * 1 (1 is the relative atomic mass of the H atom) + 16 (16 is the relative atomic mass of the oxygen atom).

A water molecule is composed of two hydrogen atoms and one oxygen atom, so its relative molecular mass is two hydrogen atoms plus one oxygen atom mass = 18

Relative atomic mass is the data obtained by scientists based on the comparison of the true mass of the atom with the mass of the 1 12 of the c-12 atom, which can be found in the periodic table.

The relative molecular mass of the compound = the sum of the relative atomic masses of all the atoms that make up the compound.

For example, if the molecular formula of water is H2O, and the relative atomic masses of H and O are respectively, then the relative molecular mass of water is 1+1+16=18

The relative molecular mass is equal to the sum of the relative atomic masses of all the atoms in the compound.

First, the meaning is different:

1. Relative molecular mass, the sum of the relative atomic mass (ar) of each atom in the chemical formula.

2. Number of molecules: the number of molecules in a given system. is dimensionless.

If necessary, use the counting unit "unit" as its unit. In chemistry and chemical engineering, the concept of "number of elementary entities" is also commonly used.

Second, the expression is different;

1. The relative molecular mass is represented by the symbol MR in units of 1. For polymers, their relative molecular weights can reach tens or even hundreds of thousands. The chemical formula of the oxide with the smallest relative molecular mass is HO.

2. The numerator number symbol is n.

3. The calculation formula is different:

1、mr=ar+arasz

2. The formula for calculating the number of molecules: n=n·na

The number of molecules is a number, which indicates the number of molecules and determines the amount of substances of the molecule; The relative molecular mass is a ratio because it reflects the relative size of the molecular mass.

The number of molecules refers to the total number of all molecules in a certain amount of substance; For example, the number of molecules of 1mol of substance is 23 power.

The relative molecular mass refers to the sum of the relative atomic masses of the atoms in the chemical formula of the molecule, for example, the relative molecular mass of 1mol of water is 18

The number of atoms refers to the relative atomic mass of a certain amount of matter, the total number of all atoms is based on 1 12 of the atomic mass of a carbon-12 as the standard, and the ratio of the average atomic mass of any kind of atom to the 1 12 of the atomic mass of a carbon-12 is called the relative atomic mass of the atom.

You can simply understand that the number of molecules and atoms refers to the number of molecules, which is equivalent to n (the actual number of particles) that we have learned

Relative molecular mass, relative atomic mass refers to mass, which is equivalent to m (mass of matter) that we have learned

The number of molecules refers to the total number of all molecules in a certain amount of substance; For example, the number of water molecules in 1mol of water is 23 power.

The relative molecular mass refers to the sum of the relative atomic masses of the atoms in the chemical formula of the molecule, for example, the relative molecular mass of 1mol of water is 18(i.e. 1+1+16=18).

The number of atoms refers to the total number of all atoms in a given amount of matter. For example, the number of atoms in 1mol of water is 3* to the 23rd power (a water molecule contains 3 atoms, 2 H, and one O).

The relative atomic mass is based on the ratio of the average atomic mass of any kind of atom to the mass of a carbon-12 atom of 1 12, which is called the relative atomic mass of the atom. For example, the relative atomic mass of the oxygen atom in the water molecule is 16 (for the carbon-12 atom).