Q6 of 24 Page 165

One mole of any substance contains 6.023 x 1023particles.

If 3.0115 x 1023 particles are present in CO2, find the number of moles.

Number of particles in one mole of any substance is 6.023 x 1023





Note:


1. If a compound or molecular substance is taken, like CO2, N2 etc, then 1


mole of the substance contains Avogadro number of molecules. 1 mole contains the mass equal to molecular weight of substance.


2. If a element is taken like C, S, Fe, then 1 mole contains Avogadro


number of atoms. 1 mole contains the mass equal to atomic weight of substance.

More from this chapter

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4

‘Cl’ represents Chlorine atom, ‘Cl2’ represents Chlorine molecule.

List out any two differences between atoms and molecules.

 5

Calculate the gram molecular mass of water from the values of gram atomic mass of Hydrogen and of Oxygen.

Gram atomic mass of Hydrogen = 1 g


Gram atomic mass of Oxygen = 16 g

 7

_________ have equal number of neutrons.

i) Isobars ii) Isotones


iii) Isotopes iv) Mass Numbers

 8

Classify the following based on atomicity:

i) Chlorine ii) Neon


iii) Phosphorous iv) Ozone