Class 10 Science Unit 7 Atoms and molecules

Atoms and molecules

                                     

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Class 10 Science                        Unit 7 Atoms and molecules

Introduction, Modern Atomic Theory

Relative Atomic Mass

Average Atomic Mass

Example 1 Calculation of average atomic mass

Example 2 Calculation of average atomic mass

Classification of molecules

Relative Molecular Mass (RMM)

Calculation of relative molecular mass –Solved example 1

Calculation of relative molecular mass –Solved example 2

Difference between atoms and molecules

Mole Concept

Percent  composition

Avogadro Hypothesis

Relation Between Vapour Density & Relative Molecular Mass

Solved Problem -1 I. Calculation of molar mass Calculate the gram molar mass of the following. 1) H₂O 2) CO₂ 3) Ca₃ (PO₄)₂

Solved Problem - II. Calculation based on number of moles from mass and volume 1) Calculate the number of moles in 46 g of sodium? 2) 5.6 litre of oxygen at S.T.P 3) Calculate the number of moles of a sample that contains 12.046 × 10²³ atoms of iron ?

Solved Problem -3 III. Calculation of mass from mole Calculate the mass of the following 1) 0.3 mole of aluminium (Atomic mass of Al = 27) 2) 2.24 litre of SO₂ gas at S.T.P 3) 1.51 × 10²³ molecules of water 4) 5 × 10²³3 molecules of glucose ?

Solved Problem -4 IV. Calculation based on number of atoms/ molecules. 1) Calculate the number of molecules in 11.2 litre of CO₂ at S.T.P 2) Calculate the number of atoms present in 1 gram of gold (Atomic mass of Au = 198) 3) Calculate the number of molecules in 54 gm of H₂O? 4) Calculate the number of atoms of oxygen and carbon in 5 moles of CO₂.

Solved Problem -5 V. Calculation based on molar volume Calculate the volume occupied by: 1) 2.5 mole of CO₂ at S.T.P 2) 3.011 × 10²³ of ammonia gas molecules 3) 14 g nitrogen gas

Solved Problem -6 VI. Calculation based on % composition Calculate % of S in H₂SO₄