Home
Class 11
CHEMISTRY
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)`
Promotional Banner

Topper's Solved these Questions

  • MOLE CONCEPT

    DINESH PUBLICATION|Exercise Straight objective|13 Videos

  • MOLE CONCEPT

    DINESH PUBLICATION|Exercise MCQ|4 Videos

  • MOLE CONCEPT

    DINESH PUBLICATION|Exercise JEE (Main)|31 Videos

  • HYDROGEN

    DINESH PUBLICATION|Exercise LONG|1 Videos

  • NOMENCLATURE OF ORGANIC COMPOUNDS

    DINESH PUBLICATION|Exercise MCQs|13 Videos

Similar Questions

Explore conceptually related problems

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

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 :

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. The number of molecules in 16 g of methane is

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 vapour density of a gas is 11.2. The volume occupied by 11.2 g of gas at NTP will be

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 3.01 xx 10^(20) molecules are removed from 98 mg of H_(2)SO_(4) , then the number of moles of H_(2)SO_(4) left will be

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 3.01xx10^(30) molecules are removed from 98 mg of H_(2)SO_(4) , then the number of moles of H_(2)SO_(4) left wlil be

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. The vapour density of a gas is 11.2. The volume occupied by 11.2 g of a gas at N.T.P. will be

If N_(A) is Avogadro's number, then the number of oxygen atom in one g-equivalent of oxygen is

If N is Avogadro's number, then the number of molecules in 6 g of hydrogen at NTP is

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 :

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

  • 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. The number of molecules in 16 g of methane is

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