How do you calculate the amount of chemical molars? How do you convert molar mass and concentration?

Reciting Moore's definition 100 times is definitely a bit of a door.

Mass molar concentration is the amount of a solute in a solution divided by the mass of the solvent. The formula is calculated as the amount of solute B in the solution n divided by the mass of solvent A, i.e., nm.

In a very dilute aqueous solution, it can be approximated that the quantity concentration of the substance is numerically equal to the mass molar concentration. This is because when the aqueous solution is very thin, the mass of the solute is negligible, the volume of the solution can be considered to be the same as the volume of water, the density is 1 kg l, and the mass of the solvent water is approximately equal to the mass of the solution, which is numerically equal to the volume of the solution v(l).

Since the molar concentration of the mass of solute B is independent of the temperature, the amount of the substance in the concentration of the solvent may be affected by the temperature. Therefore, the mass molar concentration is mostly used in thermodynamic treatment, and the mass molar concentration is mainly used in electrochemistry to express the concentration of the electrolyte. However, when the solvent is a dilute solution of water, i.e., BB< the values of BB and CB are approximately equal.

<> example: molar mass of sucrose.

342g mol, C12H22O11 molecular weight 342, 342g of sucrose is dissolved in 1 liter of solution (water), find the molar concentration of sucrose solution (m)?

Ignoring the change in v, the molar concentration of the sucrose solution is transported (m) = 1 (m).

Example: The molar mass of sucrose is 342g mol, the molecular weight of C12H22O11 is 342, 171g of sucrose is dissolved in 1 liter of solution (water), find the molar concentration of sucrose solution (m)?

Mass percentage concentration (mass fraction.

m m): most commonly used. Refers to the mass of solute per 100 grams of solution (previously stupid).

Mass Percentage (Solute Mass (g)) Solution Mass (g)) 100% = Solute Mass (g)) Solute Mass (g) + Solvent Mass (g)) 100%.

Volume percentage concentration (volume fraction.

v v): Commonly used in alcohol. Refers to the volume of solute per 100 ml of solution, in milliliters.

Volume Percentage (solute volume (ml) Solution volume (ml)) 100% = solute volume (ml) (solute volume (ml) + solvent volume (ml)) 100%.

Parts per million (ppm): Refers to the mass of solute (in milligrams) per kilogram of solution. Parts per million concentration Mass of solute (mg) Mass of solution (kg).

Summary. Extended Information:1

Determine the molar ratio in the equation of a chemical reaction For example, for 2H2O + O2 2H2O2, the ratio of oxygen to water is 1:2, i.e., 1 mole of oxygen can react 2 moles of water. 2.

Calculate the molar mass of the reactants, for example, the molar mass of an oxygen molecule is 32 g mol and the molar mass of a water molecule is 18 g mol.

Chemistry, know the mass, know the molar quantity, how to calculate the equivalent?

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Chemistry, know the mass, know the molar repentance amount, calculate the equivalence: the equivalent is calculated as: equivalent (muffled eq) = mass (g) molar (mol). Therefore, the equivalent value can be calculated based on the known mass and molar quantity, and the value of the equivalent can be <>

Extended Information:1Determine the molar ratio in the equation of the chemical reaction For example, for 2H2O + O2 2H2O2, the ratio of oxygen to water is 1:

2, i.e., 1 mole of oxygen can react 2 moles of water. 2.For example, the molar mass of an oxygen absolute gas molecule is 32 g mol, and the molar mass of a water molecule is 18 g mol.

a*na multiplies the mass of an atom by the Afgadro constant to get the molar mass of the atom, which is numerically equal to the relative atomic mass of the atom.

Question 1: How to calculate the molar mass of a high chemistry? Is there any formula?

n=m mm=pvn=nnan is the amount of matter, and the unit is mole (mol); m is the molar mass of a substance, measured in grams per mol (g mol), and the value is equal to the atomic or molecular weight of the chemical formula, such as 1g mol for hydrogen atom, 2g mol for hydrogen, and 18g mol for water; m is the mass of the substance, and the unit is grams (g); p is the density of the substance in grams per cubic centimeter (g cm 3) or grams per milliliter (g ml); v is the volume of the substance, measured in cubic centimeters (cm3) or milliliters (ml); n is the number of atoms or molecules, the unit is 1, and it can also be regarded as having no unit; Na is Avogadro's constant, and the value is per mol (mol -1), that is, there is one atom or molecule in 1mol.

Question 2: How to find the molar mass of an ion in the chemical formula in high school chemistry The molar mass is the sum of the corresponding atomic masses in the molecular formula, until the mass of the atoms that make up the molecule can find the molar mass of the corresponding molecule, and the same until the molar mass of a molecule can find the atomic mass of one of the atoms. For example, the molar mass of ACL2 is 95g mol-1 to find the atomic mass of A.

m(acl2)=m(a)+，m(a)=m(acl2)

Question 3: How to find the molar mass given the chemical formula and mass? Quality here is a useless condition.

If the chemical formula is known, then the value of the formula of the chemical formula is the value of the molar mass of the substance.

For example, the molecular formula of sulfuric acid is H2SO4 and the molecular weight is 98, then the molar mass of sulfuric acid is 98 grams.

Question 4: The molar mass of the third year of chemistry is 1:16; 1:1;1/16 40;20g;Piece; 16; 182;:1

1*The relative molecular mass (or relative atomic mass) of a substance is the formula: m=n*m (m is the molar mass, in g mol, numerically equal to the relative molecular mass or relative atomic mass).

For example, the relative molecular weight of 1molH2O H2O.

When using molars, it is necessary to calibrate what the coarse macro is this substance, otherwise it is meaningless. Knowing what this substance is, we also know the molar mass of this substance, and then we can convert the quantity (mol) of this substance to mass (g).For example, sulfuric acid has a molar mass of 98 g mol

Calculate the mass of 5 moles and molar sulfuric acid.

The mass of 5mol of sulfuric acid is: 98 5 = 490g

The mass of sulfuric acid is: 98

Mole (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 with the symbol 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 specific combinations of these particles.

About one is 1 mole, just as people often say that a dozen refers to 12, and "mole" is just a special unit like "dozen". g) The number of atoms contained in c(carbon-12) is 1 mole.

Molar Calculation (AmountofSubstanceConcentration) Formula:

m（mol/l）＝n（mol）/v（l）

In the formula, c(b) represents the amount of the solute substance, n represents the amount of the solute, and v represents the volume of the solution. The Si unit of the amount of matter is mol·m, and the commonly used single bright position is mol·dm or mol·l.