write down the formula of calcium carbonate aluminium Hydroxide write the example of polyatomic Ions calculate the number of oxygen atoms in 22 gram of c o square
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Symbol Ca CO₃
Valency 2 2
Chemical formula : CaCO₃
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Symbol Al OH
Valency 3 1-
Chemical formula : Al(OH)₃
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Groups of atoms carrying charges are known as polyatomic ions.
Examples - PO₄³⁻ , NO₃⁻
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Given mass = 22 grams
Molar mass of CO₂ = 12 + 2 × 16 = 44 GRAMS
No: of moles = Given mass ÷ Molar mass
= 22 ÷ 44 = 0.5 moles
No: of particles (atoms ) = No: of moles × Avogadro no:
= 0.5 × 6.022 × 10²³
As there are 2 atoms of oxygen in CO₂ :
No: of oxygen atoms = 0.5 × 6.022 × 10²³ × 2
= 6.022 × 10²³ atoms of oxygen
Symbol Ca CO₃
Valency 2 2
Chemical formula : CaCO₃
-----------------------------------------------------------------------
Symbol Al OH
Valency 3 1-
Chemical formula : Al(OH)₃
-------------------------------------------------------------------------------------------------
Groups of atoms carrying charges are known as polyatomic ions.
Examples - PO₄³⁻ , NO₃⁻
--------------------------------------------------------------------------------------------------------
Given mass = 22 grams
Molar mass of CO₂ = 12 + 2 × 16 = 44 GRAMS
No: of moles = Given mass ÷ Molar mass
= 22 ÷ 44 = 0.5 moles
No: of particles (atoms ) = No: of moles × Avogadro no:
= 0.5 × 6.022 × 10²³
As there are 2 atoms of oxygen in CO₂ :
No: of oxygen atoms = 0.5 × 6.022 × 10²³ × 2
= 6.022 × 10²³ atoms of oxygen
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