NCERT Class XI Chemistry Structure of Atom Solutions

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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 × 1031 kg.
1 g or 103 kg =
1
9.109×1031
×103
electrons = 0.1098 × 1028 electrons
= 1.098 × 1027 electrons
(ii) Mass of 1 electron = 9.109 × 1031 kg
Mass of 1 mole of electrons = 9.109 × 1031 × 6.022 × 1023 = 5.480 × 107 kg
Charge of 1 electron = 1.602 × 1019 C
Charge of 1 mole of electrons = 1.602 × 1019 × 6.022 × 1023 C = 9.647 × 104 C
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