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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
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