NCERT Class XI Chemistry Structure of Atom Solutions

Question : 1

Total: 67

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

Solution:

(i) Mass of an electron is 9.109 × 10–31 kg.
1 g or 10−3 kg =

9.109×10−31

×10−3 electrons = 0.1098 × 1028 electrons
= 1.098 × 1027 electrons
(ii) Mass of 1 electron = 9.109 × 10–31 kg
Mass of 1 mole of electrons = 9.109 × 10–31 × 6.022 × 1023 = 5.480 × 10–7 kg
Charge of 1 electron = 1.602 × 10–19 C
Charge of 1 mole of electrons = 1.602 × 10–19 × 6.022 × 1023 C = 9.647 × 104 C

Go to Question:

Next Question