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

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

Text Solution

Verified by Experts

mass of one electron `= 9.10939 xx 10 ^(-31) kg `
number of electrons that weigh ` 9.10939 xx 10^(-31) kg = 1`
number of electrons that will weigh ` 1 g = ( 1xx 10^(-3) kg) `
`1/( 9.10939xx10 ^(-31)) xx(1xx 10^(-3)kg)`
`0.1098xx 10^(-3) + 31 `
` 0.1098 xx 10^(28)`
`1.098 xx 10^(27)`
(ii) mass of one electron =`9.10939 xx10^(-31) kg`
mass of one electron = `(6.022 xx 10^(23)) xx ( 9. 10939xx 10^(-31) kg)` ltbr gt `5.48 xx 10^(-7) kg`
charge on one electron `= 1.6022 xx 10^(-19) ` coulomb
charge on one mole of electron `= ( 1.6022 xx 10 (-19) C) (6.022 xx10^(23)) `
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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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