How to calculate Avogadro s constant, how to calculate Avogadro s constant?

Of course. m = m na (m is the mass of a particle, m is the molar mass of this particle, and na is Avogadro's constant). As long as there is mass and molar mass you can calculate Avogadro's constant, I hope it will help you.

The number of basic units (usually atoms or molecules) n contained in a sample, and the amount of matter it contains.

The ratio between n (in moles) is na=n n

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The formula for the quantity of matter1. The amount of matter = the number of particles Avogadro's constant.

n=n/na)

2. The quantity of the substance = the mass of the substance The molar mass of the substance.

n=m/m)

3. The amount of matter = the volume of the gas The molar volume of the gas.

n=v/vm)

4. C = 1000ml L (density) W M Note: n (mol): the amount of the substance; n：

Slightly change the posture to call the number of grains; v(l): volume of matter; m(g mol): molar mass; w%：

The mass fraction of the solute in solution.

Mass percentage concentration = solute mass solution mass * 100%.

Quantity related formulas for substances.

1、n=n/na

na: Avogadro's constant.

2、n=m/m

m: molar mass.

3、n=v/vm

vm: molar volume.

Average molar mass: The ratio of the quantity of the substance is found using the average molar mass of the mixture: average molar mass = molar mass of each component in the mixture The quantity fraction of the substance of the component (if it is a gas component, it can be a volume fraction.

m m denotes the molar mass of the two substances in the mixture m average refers to the average molar mass of the mixed substances).

So,Avogadro's constantHow did you get it? There have been many ways to measure it throughout history, such as:Brownian motionmethod, oil drop method, electricity analysis method, and now, in order to get the most accurate values, it is usedX-raysCrystal density method.

The key to this method is to first make a very round,It was perfectof the ball. This ball is made up of high-purity silicon-28 crystals and weighs a full kilogram. It is quite laborious to make it washable, first to obtain high-purity silicon crystals, and then to go through precise calculations and polishing.

So how do you measure Avogadro's constant? In fact, to put it bluntly, it is to count atoms.

The lattice arrangement of this silicon sphere is very regular, atomic weight.

and the total mass, so as long as the number of atoms is calculated by the lattice parameters, the Avogadro constant can be calculated.

By the way, the most recently published calculation of Avogadro's constant is. Why do you need to measure this constant so accurately? One reason lies in the fact that scientists.

Mass needs to be redefined with precise physical constants. Traditionally, the method of defining units of mass has been simple and crude, which is to cast a lump of platinum-iridium alloy.

Then take its mass as the standard of "one kilogram", and all other instruments and things are calibrated with it. This piece of platinum-iridium scattered state is the prototype of the kilogram, and its original is stored in the International Bureau of Weights and Measures in Paris, France, and has been used for more than 100 years. Here's what it looks like:

It can be seen in order to keep it stable.

People are isolated from the outside air when they are preserved, and platinum-iridium alloy itself is a very stable material. So far, the mass of the kilogram prototype has basically not changed - does that sound OK? But as an important criterion, it's not enough to guarantee only "basic".

In fact, its quality has changed.

Although it is only a few tens of micrograms, it still has a lot of impact on situations that require accurate measurement. So what to do? The way scientists think is that we don't need physical objects, let's redefine mass through physical constants, as long as the constants are accurate enough, it can be stable forever.

It is Planck's constant that is used to define mass.

Does it sound like it has nothing to do with this silicon ball? In fact, measuring Avogadro's constant is a way to calibrate Planck's constant, which can help scientists check whether the new standard of quality is accurate.

Calculation formula: 1. Avogadro's constant (symbol: na or l) is defined as a ratio, which is the ratio between the number of basic units (generally atoms or molecules) n contained in a sample and the amount of matter n (in moles) it contains, and the formula is na=n n.

In general calculations, it is often taken or approximated.

The volume of mol NaCl is , and NaCl is a cubic crystal, and the volume occupied by four NaCl molecules is (2d), and the number of 1mol NaCl is V [(2D) 4]=V 2D, so Avogadro's constant Na=m 2PD

If p is the atomic density, then the volume occupied by an atom is (2d), so Avogadro's constant na=m 2pd.

The law of constants: At the same temperature and pressure, any gas of the same volume contains the same number of molecules.

1. Scope: gas (can be pure and pure, or can be a mixture).

2. Condition: the same temperature, the same pressure and the same volume.

3. Special case: molar volume of gas.

is in the ideal gas state:

1、p1v1/t1=p2v2/t2

2. PV=NRT=MRT M (r is constant).

3. Same temperature and pressure v1 v2=n1 n2=n1 n2, p1 p2=n1 n2=n1 n2

4. Same temperature and volume p1 p2=n1 n2=n1 n2

5. Same temperature, same pressure and same mass v1 v2=m2 m1

6. The same temperature, same pressure and same volume m1 m2=m1 m2

The amount of matter = the number of particles Avogadro's constant: n = n na

Quantity of matter = mass of matter Molar mass: n = m m

Quantity of matter = volume of gas Molar volume of gas: n = v v

So, n na = m m m = v v = n.

The quantity of the substance – n, the mass of the substance – m. Molar mass – m, number of particles (number of particles) – n. Avogadro's constant – the volume of the gas – v. Molar volume of gas – v – l mol——。

Formula: na=n n(na: Avogadro's constant, n: number of particles, n: amount of matter.

The approximate value of na is.

Avogadro constant.

Formerly known as Avogadro's constant, it is a thermal constant, symbolized na. Its numerical hand hunger is generally taken when calculating or. Its formal definition is the number of carbon-12 atoms contained in carbon-12.

Avogadro constant conversion formula: n=n na=m m=v vm=c*v Avogadro's constant.

The number of atoms contained in it is called Avogadro's constant. The symbol for Avogadro's constant is na. The approximation of Avogadro is as follows:

Symbol: na Meaning: 1mol The number of particles contained in any particle is the Avogadro constant.

The definition of Avogadro's constant refers to the number of atoms contained in 12g12c, which is an approximation of Avogadro's constant, and there is a difference between the two. The symbol for Avogadro's constant is na, which is not a pure number, and its unit is mol-1. The Avogadro constant can be measured using a variety of experimental methods.