Question

1.Calculate the number of electrons which will together weigh one gram.
2.Calculate the mass and charge of one mole of elctrons.​

Answer 1

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(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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Answer 2

Answer:

(i) Mass of one electron = 9.10939 × 10–31 kg

Number of electrons that weigh 9.10939 × 10–31 kg = 1

Number of electrons that will weigh 1 g = (1 × 10–3 kg) = 0.1098 × 1031 x 10 -3

                                                                                     = 0.1098 × 1028

                                                                                                                                    = 1.098 × 1027

(ii) Mass of one electron = 9.10939 × 10–31 kg

Mass of one mole of electron = (6.022 × 1023) × (9.10939 ×10–31 kg) = 5.48 × 10–7 kg

Charge on one electron = 1.6022 × 10–19 coulomb

Charge on one mole of electron = (1.6022 × 10–19 C) X (6.022 × 1023) = 9.65 × 104 C