Question

Explain with examples what is
meant by a 'mole of a substance.
​

Answer 1

Answer:

A mole corresponds to the mass of a substance that contains 6.023 x 1023 particles of the substance.

The mole is the SI unit for the amount of a substance. Its symbol is mol.

For example, in the following reaction one mole of bromine gains two moles of electrons to form two moles of bromide ions:

Br2(aq) + 2e → 2Br-

HOPE THIS HELPS YOU...

Answer 2

Question : What do you mean by a "mole" of a substance?

Answer:-

Here is a fun way to understand what mole is.

Let us analyse a situation where you go to a fruit seller and you ask for 1 dozen of apples.

It is automatically stated that 1 dozen = 12 apples. The vendor asks you if there is any other fruit required and you reply, "Yes, I'd like twenty four oranges". Twenty four can simply be expressed as 2 dozen oranges, right?

Similarly, in chemistry, there is a problem where you can't express exponents of 10 by writing them just like that. It is laborious and there is a need for collective name for representing the number of particles in a given element.

Sure, if only it was as simple as saying 12 apples, it is quite difficult to compute so many powers and exponents. Hence we call it a mole.

A mole of a substance means that 1 mole of any element or a compound contains :-

$6.023 \times 10 {}^{23}$

particles - be it atoms or molecules.

I know this isn't an example you can write it in an exam, but this is a fun way of understanding mole concept.

You can also say, 1 mole of an element, say Sodium or 1 mole of common salt, NaCl contains 6.023 x 10^23 atoms. You can provide more examples and write compound names.

This number is termed as "Avagadro's Number".