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Class 11
Chemistry
Structure of Atom
i calculate the number of electrons which will t...

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

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

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

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

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