CBSE Class 9 Answered
what is mole concept
Asked by Shubham pratap | 23 Nov, 2013, 12:53: PM
Expert Answer
A mole is simply a unit of measurement. Units are invented when existing units are inadequate. Chemical reactions often take place at levels where using grams wouldn't make sense, yet using absolute numbers of atoms/molecules/ions would be confusing, too.
A mole is a collection of atoms with a mass equal to the atomic weight in grams.
The number of atoms in a mole is 6.02 x 1023. This works because one amu is 1.66 x 10-24 gram, so it takes 6.02 x 1023 of them to make one gram.
This is one of the most useful concepts in chemistry.
The atomic weight of lithium is 6.941amu. This means that a sample with a mass of 6.941 grams has 6.02 x 1023 atoms of lithium in it.
Always remember that this works for molecules and ions, too.
The number 6.02 x 1023 is known as Avogadro’s number in honor of the chemist who first proposed a law relating the volume of a gas to the number of gaseous particles it contains.
Answered by Vaibhav Chavan | 25 Nov, 2013, 08:56: AM
Application Videos
Concept Videos
CBSE 9 - Chemistry
Asked by rajputanaji290 | 03 Oct, 2023, 09:30: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by muditsharma287 | 09 Mar, 2023, 10:10: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by shivalaxmi0205 | 08 Mar, 2023, 07:46: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by shivalaxmi0205 | 08 Mar, 2023, 07:43: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by jssjj | 19 Jan, 2023, 07:25: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by mohammedhaqqani.6b | 14 Jun, 2022, 02:51: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by gauravsingh36428 | 14 Mar, 2022, 07:44: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by jiyajthakor | 28 Feb, 2022, 07:03: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by gillsaabjashanpreetsingh3 | 16 Jan, 2022, 01:23: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by prachisharma772007 | 16 Jan, 2022, 11:12: AM
ANSWERED BY EXPERT