(i) Calculate the number of electrons wh | Class 11 Chemistry Chapter Structure of Atom, Structure of Atom NCERT Solutions

Question:

(i) Calculate the number of electrons which will together weigh one gram.
(ii) Calculate the mass and charge of one mole of electrons.

Answer:

(i) Mass of an electron = 9.1 x 10-28 g

Or

9.1 x 10-28 g contains = 1 electron

Therefore 1g contains = 1/9.1 x 10-28 *1 = 1.098 x 1027 electrons

 

(ii) We know, one mole of electron = 6.022 x 1023 electron

Mass of one electron = 9.1 × 10–28 g

Or

mass of 6.022 x 1023 electron = 9.1 x 10-28 x 6.022 x 1023 = 5.48 x 10-4 g

Charge on one electron = 1.6 × 10–19 coulomb

Charge on one mole of electron = (1.6 × 10–19 C x 6.022 × 1023)

= 9.63 × 104 C

 


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Comments

  • Shahin
  • 2020-04-28 09:45:44

Thanks...


  • Priya nayak
  • 2019-10-20 10:11:59

Thanks for the solution


  • Anant
  • 2019-09-20 14:11:39

Mass of e is 9.1 x 10^31 kg


  • Siddhu
  • 2019-08-11 21:28:30

Mr/Mrs cha,it's not necessary to take the mass of electron in kg only. We know that the mass of electron is 9.1*10^-28g or 9.1*10^-31kg so the solved question is right


  • GANDHASIRI KIRANKUMAR
  • 2019-08-09 10:23:18

Super


  • Cha
  • 2019-06-29 20:03:47

Mass of electron should be in kg


  • Cha
  • 2019-06-29 19:56:04

Mass of a electron is wrong here.It should be 9.1x 10^-31


  • Sneha
  • 2019-06-20 16:07:26

Thnks alot


  • Nice
  • 2019-06-14 10:25:01

🙏🙏👍


  • Vansh Tyagi
  • 2019-06-12 15:00:32

But mass of electron is 9.1 ×10(-34)


Comment(s) on this Question

Welcome to the NCERT Solutions for Class 11 Chemistry - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 1: (i) Calculate the number of electrons which will together weigh one gram. (ii) Calculate the mass a....