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(i) Calculate the number of electrons wh...

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

Text Solution

Verified by Experts

(i) Mass of an electron `=9.1 xx 10^(-28) g`
`9.1 xx 10^(-28) g` is the mass of = 1 electron
1.0 g is the mass of `=(1)/(9.1 xx 10^(-28))=1.098 xx 10^(27)` electrons
(ii) One mole of electrons `=6.022 xx 10^(23) `electrons
Mass of 1 electron `=9.1 xx 10^(-31) kg`
Mass of `6.022 xx 10^(23)` electrons `=(9.1 xx 10^(-31)kg) xx (6.022 xx 10^(23))=5.48 xx 10^(-7)kg`
Charge on one electron =`1.602 xx 10^(-19) ` couldomb
Charge on one mole electrons `=1.602 xx 10^(-19) xx 6.022 xx 10^(23) = 9.65 xx 10^(4)` coulombs
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Knowledge Check

  • The number of electrons which will together weigh one gram is

    A
    `1.098xx10^(27)` electrons
    B
    `9.1096xx10^(31)` electrons
    C
    1 electron
    D
    `1xx10^(4)` electrons
  • The mass and charge of 1 mole electrons will be:

    A
    1kg,96500C
    B
    0.55mg: 96500C
    C
    1.55mg:96500C
    D
    5.5mg 96500C
  • The mass of one mole of electron is

    A
    `9.1 xx 10^(-28) g`
    B
    `0.55 mg`
    C
    `9.1 xx 10^(-24)g`
    D
    `1.008 mg`
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