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Calculate the Number of Electrons Which Together Weigh One Gram | NEET Chemistry Tricks

 - Dr.Sanjaykumar Pawar  

Number of Electrons in 1 Gram: Easy NEET Shortcut and Solution 


Educational infographic explaining how to calculate the number of electrons in one gram and the mass and charge of one mole of electrons using NEET chemistry shortcuts.
Quick NEET revision chart showing electron mass, electron charge, Avogadro number, and shortcuts for calculating electrons in one gram.
INTERNAL LINK 
Mole Concept Complete Notes
Avogadro Number Explained
Faraday Constant and Electrochemistry
Atomic Structure NEET Notes
Electron, Proton and Neutron Comparison
Physical Chemistry Formula Sheet
NCERT Chemistry Chapter Wise Notes
Most Important NEET Chemistry Numericals
Electrochemistry Short Tricks
Scientific Notation and Logarithms for NEET
Atomic Mass and Relative Mass Calculations
Important Constants in Chemistry
Stoichiometry Practice Questions
Chemistry One-Liner Revision Notes
Previous Year NEET Mole Concept Questions


 FAQ QUESTIONS
Q. How many electrons together weigh 1 gram?
A. Approximately 1.098 × 10²⁷ electrons.
Q. What is the mass of one mole of electrons?
A. 5.48 × 10⁻⁴ grams.
Q. What is the charge of one mole of electrons?
A. 9.63 × 10⁴ coulombs.
Q. What is the value of one Faraday?
A. Approximately 96,500 coulombs.
Q. Why is Avogadro number used in electron calculations?
A. It helps calculate properties of one mole of electrons and particles.
NEET Chemistry - Electron Numericals

NEET Chemistry Master Revision

Question

Calculate:

(i) The number of electrons which together weigh 1 gram.
(ii) The mass and charge of one mole of electrons.

Detailed Solution

Given:
Mass of one electron = 9.108 × 10-28 g
Charge of one electron = 1.6 × 10-19 C
Avogadro Number = 6.022 × 1023

(i) Number of electrons weighing 1 gram
Number of electrons = 1 / (9.108 × 10-28)

= 1.098 × 1027

Answer: 1.098 × 1027 electrons

(ii) Mass of one mole of electrons
Mass = 9.108 × 10-28 × 6.022 × 1023

= 5.48 × 10-4 g

Charge of one mole of electrons
Charge = 1.6 × 10-19 × 6.022 × 1023

= 9.63 × 104 C

Quick Revision Table

Quantity Value Memory Code
Mass of Electron 9.108 × 10⁻²⁸ g 9 Rule
Charge of Electron 1.6 × 10⁻¹⁹ C 16 Rule
Avogadro Number 6.022 × 10²³ 6 Rule
Electrons in 1 g 1.098 × 10²⁷ 1 Rule
Mass of 1 Mole Electrons 5.48 × 10⁻⁴ g 5 Rule
Charge of 1 Mole Electrons 9.63 × 10⁴ C 9 Rule

Super Mnemonic

9 - 16 - 6 → 1 - 5 - 9

9 → Electron Mass
16 → Electron Charge
6 → Avogadro Number
1 → 1.098 × 10²⁷ electrons
5 → 5.48 × 10⁻⁴ g
9 → 9.63 × 10⁴ C

Mnemonic Sentence:
"9 का Mass, 16 का Charge, 6 का Mole, फिर 1-5-9 Final Goal"

NEET Fast Tricks

Trick 1

1 gram electrons:
1 / 10⁻²⁸ = 10²⁸
1/9 ≈ 0.11
Answer ≈ 1.1 × 10²⁷

Trick 2

Mass of 1 Mole Electron
9 × 6 = 54
10⁻²⁸ × 10²³ = 10⁻⁵
54 × 10⁻⁵ = 5.4 × 10⁻⁴ g

Trick 3

Charge of 1 Mole Electron
1.6 × 6 ≈ 9.6
10⁻¹⁹ × 10²³ = 10⁴
Answer = 9.6 × 10⁴ C

NEET Trap Questions

Q1. One Faraday equals?
Ans: 9.65 × 10⁴ C

Q2. Number of electrons in one Faraday?
Ans: 6.022 × 10²³

Q3. Mass of one mole electrons?
Ans: 5.48 × 10⁻⁴ g

Q4. Charge of one mole electrons?
Ans: 9.63 × 10⁴ C

Final Revision Box

Electron Mass = 9 × 10⁻²⁸ g
Electron Charge = 1.6 × 10⁻¹⁹ C
Avogadro Number = 6 × 10²³
1 gram electrons = 1.1 × 10²⁷
1 mole electron mass = 5.48 × 10⁻⁴ g
1 mole electron charge = 9.63 × 10⁴ C
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