Question

notes on mole concept class 11 chemistry

Answer 1

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Answer 2

One gram atom of any element contains the same number of atoms and one gram of molecule of any substance contains the same number of molecules.

The value was found to be 6.022137 × 1023

The value generally found is 6.022 × 1023 

This is called Avogadro's number.

Avogadro's number may be defined as the number of atoms present in one gram atom of element or the number of molecules present in one gram molecule of the substance.

A mole is defined as the amount of substance which has mass equal to gram atomic mass if the substance is atomic or gram molecular mass if the substance is molecular.
1 mole of carbon atoms =12 grams

1 mole of sodium atoms = 23 grams

1 mole of Oxygen atom = 16 grams

1 mole of Oxygen molecule = 32 grams

1 mole of water molecule = 18 grams

1 mole of carbon dioxide molecule = 44 grams

A mole is defined as that amount of substance which contains Avogadro’s number of atoms if the substance is atomic or Avogadro’s number of molecules if the substance is molecular.

1 mole of carbon atoms = 6.022 ×1023 atoms of carbon.

1 mole of sodium atom = 6.022 ×1023 atoms of sodium

1 mole of Oxygen atom =6.022 ×1023 atoms of oxygen

1 mole of Oxygen molecule =6.022 ×1023  molecules of oxygen