Question

what is mole concept ?please explain it

Answer 1

Hi,

The mole is a unit of measurement for the amount of substance. Moles give us a consistent method to convert between atoms/molecules and grams.

The mathematical expression for calculating moles is expressed as:

 moles = mass / molar mass

We can express moles in terms of molecular mass, number of atoms/molecules and in terms of volume.

·  1 mole of a pure substance has a mass in grams equal to its molecular mass.

1 mole contains the same number of particles as there are in 12g of carbon-12 atoms. This number is called Avogadro’s number and is equal to 6.023 × 1023 particles.1 mole of a gas occupies a volume of: 22.4 litres at S.T.P.

For example: 1 mole of sodium atom has mass 23 g. It contains 6.023 × 1023 atoms and occupies 22.4 litres of volume at S.T.P.

Let us solve a simple numerical to understand this concept in a better way.

Numerical:

Calculate the number of particles in each of the 46 g of Na atoms.

Solution:

In this numerical it is desired to find the number of particles in 46 gm of Na.

We know that one mole of Na contains 6.023 × 1023 particles.

Therefore, we will first find the number of moles in 46 gm of Na.

moles = mass/moler mass
=46/23
=2 moles

We know that 1 mole = 6.022 × 1023 particles.

Therefore, 2 moles = 2×6.022 × 1023 particles

  = 12.044 × 1023 particles

Hence, 46 gm of Na contains 12.044 × 1023particles.

To be perfect in the mole concept, try to solve more numerical.

Cheers!

Answer 2

Answer:

Hi

see the picture it will be helpful!