what is avrogard number and why it is called constant ?
Answers
Answer: The number of units in one mole of any substance is called Avogadro’s number or Avogadro’s constant. It is equal to 6.022140857×1023. The units may be electrons, ions, atoms, or molecules, depending on the character of the reaction and the nature of the substance.
So, if you wanted to know the number of particles in 3 moles of a substance, the value would be:
= 3 x 6.023 x 1023
= 1.81 x 1024 particles
Explanation:Simply put, it creates a bridge between the macroscopic world and the microscopic world by relating the amount of substance to the number of particles. It also provides the relationship between other physical constants and properties. Some of them are:
The relationship between the gas constant R and the Boltzmann constant kB: R=kBNA
The relationship between the Faraday constant F and the elementary charge e: F=NAe
The relationship between atomic mass unit u and molar mass constant Mu: 1u=Mu/NA
In chemistry, we always take a macroscopic approach to measuring stuff. We measure the total volume of a substance, or the temperature, or the mass of a substance and general things along those lines. But if we look at this from the atomic level, knowledge of the velocity and momentum of particles are important. The atomic mass is important. Avogadro’s number connects both of these.