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Atoms and molecules are so small in size...

Atoms and molecules are so small in size that it is neither possible to count them individually nor possible to determine their mass. These are counted collectively in terms of Avogadro's number. The mass of Avogadro's number of atoms and molecules is known as gram atomic mass and gram molecular mass respectively. The volume occupied by Avogadro's number of molecules of a gas or vapours is known as molar volume.
If `N_(A)` is Avogadro's number, then the number of valence electrons in 4.2 g of nitride ions `(N^(3-))` is :

A

`4.2 N_(A)`

B

`2.4 N_(A)`

C

`1.6 N_(A)`

D

`3.2 N_(A)`

Text Solution

Verified by Experts

The correct Answer is:
B
Moles of `N^(3-)` ion `= (4.2)/(14)=0.3` mol
No. of `N^(3-)` ions `= 0.3 xx N_(A)` ions
No. of valence electrons in one,
`N^(3-)` ion `= 5+3 = 8`
`:.` Total no. of electrons
`= 0.3 xx 8 xx N_(A) = 2.4 N_(A)`
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Knowledge Check

  • Atoms and molecules are so small in size that it is neither possible to count them individually nor possible to determine their mass. These are counted collectively in terms of Avogadro's number. The mass of Avogadro's number of atoms and molecules of a substance is known as gram atomic mass and gram molecular mass respectively. The volume occupied by Avogadro's number of molecules of a gas or vapour, is known as molar volume. If N_(A) is Avogadro's number, the number of valence electrons in 4.2 g of nitride ions (N^(3-)) is

    A
    `4.2 N_(A)`
    B
    `2.4 N_(A)`
    C
    `1.6 N_(A)`
    D
    `3.2 N_(A)`

  • Atoms and molecules are so small in size that it is neither possible to count them individually nor possible to determine their mass. These are counted collectively in terms of Avogadro's number. The mass of Avogadro's number of atoms and molecules is known as gram atomic mass and gram molecular mass respectively. The volume occupied by Avogadro's number of molecules of a gas or vapours is known as molar volume. The number of molecules in 16 g of methane is :

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    `3.0 xx 10^(23)`
    B
    `(16)/(6.022)xx10^(23)`
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    A
    `3.0xx10^(23)`
    B
    `(16)/(6.022)xx10^(23)`
    C
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