Mole Concept and Stoichiometry | Numericals on Mole Concept Class 10 ICSE |

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Syllabus of Mole Concept and Stoichiometry:
(i) Gay Lussac’s Law of Combining Volumes; Avogadro’s Law.
• Idea of mole – a number just as a dozen, a gross (Avogadro’s number).
• Avogadro’s Law - statement and explanation.
• Gay Lussac’s Law of Combining Volumes.
– Statement and explanation.
• Understanding molar volume- “the mass of 22.4 litres of any gas at S.T.P. is equal
to its molar mass”. (Questions will not be set on formal proof but may be taught for
clear understanding).
• Simple calculations based on the molar volume and Gay Lussac’s law.
(ii) Refer to the atomicity of hydrogen, oxygen, nitrogen and chlorine (proof not required). The explanation can be given using equations for the formation of HCl, NH3, and NO.
(iii)Vapour Density and its relation to relative molecular mass:
• Molecular mass = 2×vapour density
(formal proof not required)
• Deduction of simple (empirical) and molecular formula from:
(a) the percentage composition of a compound.
(b) the masses of combining elements.
(iv) Mole and its relation to mass.
• Relating mole and atomic mass; arriving at gram atomic mass and then gram
atom; atomic mass is a number dealing with one atom; gram atomic mass is the
mass of one mole of atoms.
• Relating mole and molecular mass arriving at gram molecular mass and gram molecule – molecular mass is a number dealing with a molecule, gram molecular mass is the mass of one mole of molecules.
• Simple calculations based on relation of mole to mass, volume and Avogadro’s
number.
(v) Simple calculations based on chemical equations
Related to weight and/or volumes of both reactants and products.






















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