Predict the total number of atoms in each case.
(1) Calcium phosphate (i) Hydrogen sulphide
(iii) Magnesium bromide (iv) Sodium oxide
(V) Aluminium hydroxide
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Answers
Question:
Predict the total number of atoms in each case.
(i) Calcium phosphate
(ii) Hydrogen sulphide
(iii) Magnesium bromide
(iv) Sodium oxide
(v) Aluminium hydroxide
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Answer:
(i) Calcium phosphate = Ca₃(PO₄)₂
Total atoms = 3 + 2(1+4) = 13 atoms
(ii) Hydrogen Sulphide =H₂S
Total atoms = 2 + 1 = 3 atoms
(iii) Magnesium bromide = MgBr₂
Total atoms = 1 + 2 = 3 atoms
(iv) Sodium oxide = Na₂O
Total atoms = 2 + 1 = 3 atoms
(v) Aluminum hydroxide = Al(OH)₃
Total atoms = 1 + 3(1 + 1) = 7 atoms
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i. Calcium phosphate [Ca3 (PO4)2] : here are three calcium atoms, two phosphorus atoms and eight oxygen atoms. Total number of atoms = 2Ca + 2P + 8O Hence, there are total 12 atoms. ii. Hydrogen sulphide (H2S) : There are two hydrogen atoms and one sulphur atom. Total number of atoms = 2H + 1S Hence, there are total 3 atoms. iii. Magnesium bromide (MgBr2 ) : There are two bromine atoms and one magnesium atom. Total number of atoms = 2Br + 1Mg Hence, there are total 3 atoms. iv. Sodium oxide (Na2O): There are two sodium atoms and one oxygen atom. Total number of atoms = 2Na + 1O Hence, there are total 3 atoms. v. Aluminium hydroxide [Al(OH)3]: There are three hydrogen and oxygen atoms and one atom of aluminum. Total number of atoms = 3H + 3O + 1Al Hence, there are total 7 atoms.