Avagordas number

Avogadro's number = 6.0221415 × 1023 This number denotes the number of atoms or molecules present in a mole of a substance.This number has a special purpose in chemistry , because it is used in many calculations.It is very advisable that you remember the constant number that is approximately 6.022 x

 10^23. 
You may be required to use this number in your a level chemistry exam.