■ Definition : Mole: One mole is the amount of any substance which contains the same number of particles as there are in 12g of Carbon-12, that is or the Avogrado constant.
■ Relationship between number of moles and number of particles.
► | 1 mole of any substance contains particle of that substances (atoms, molecules or ions). | |||||
► | For atom :
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► | For molecule:
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► | For ion:
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■ Summary of relationship between number of moles and number of particles.
✍ Worked-example 3.2(a)
Calculate the number of particle in
(a) 0.5 mole of Copper |
Solution Number of particle in 0.5 mole of copper atom |
(b) 0.25 mole Lead(II) ions, |
Solution Number of particle in 0.25 mole of Lead(II) ions, ion |
(c) 3.0 moles Carbon Dioxide, |
Solution Number of particle in 3.0 moles of Carbon Dioxide molecule |
✍ Worked-example 3.2(b)
Calculate the number of moles of the following substances
(a) atom of Silver, Ag |
Solution Number of moles = 2.5 mol |
(b) Oxide ions, |
Solution Number of moles = 0.5 mol |
(c) Nitrogen molecules, |
Solution Number of moles = 7.5 mol of molecules |
✍ Worked-example 3.2(c)
(a) Find the number of atoms in 1.5 moles of
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(b) Find the number of ions in 0.5 mole of Magnesium Chloride,
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⇲ For exercise(objective and subjective), download for free on Android OS. | ||
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