The Mole Concept
The Mole Concept
Mole Concept:
Wilhelm Ostwald introduced the term ‘mole’ in 1896, which was accepted as unit to represent a large quantity of atoms in 1967. The mole is the amount of a substance which contains as many particles (atoms, ions, molecules, formula unit etc.) as in 12gm of C-12. Thus, one mole of any species is that quantity in number having a mass equal to its atomic or molecular mass in grams.
The number of particles present in 1 mole of any substance is same and fixed which is equal to . This is a constant, known as Avogadro constant or Avogadro number (
) named in the honour of Italian scientist Amedeo Avogadro. Thus, mole is also defined as number of particles equal to the Avogadro constant.
Which of the following are correct : (a) Wilhelm Ostwald introduced the term ‘mole’ in 1896. (b) The mole is the amount of a substance which contains as many particles (atoms, ions, molecules, formula unit etc.) as in 12gm of C-12. (c) One mole of any species is that quantity in number having a mass equal to its atomic or molecular mass in grams. | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following are correct : (a) 1 mole of sodium is equals to 23 g. (b) 1 mole of chlorine is equals to 35.5 g. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct : (a) The number of particles present in 1 mole of any substance is same and fixed which is equal to (b) Mole is also defined as number of particles equal to the Avogadro constant. | |||
| Right Option : C | |||
| View Explanation | |||
Students / Parents Reviews [10]
I have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
Yatharthi Sharma
10thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Eshan Arora
8thBeing a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
Prisha Gupta
8thIt was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
Cheshta
10thA marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
Archit Segal
7thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
7thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
10thMy experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
Hiya Gupta
8thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
