1.

(i) Calculate molar mass of Al(OH)_(3). (Al = 27 u, O = 16 u, H = 14) (ii) Write chemical formulae of ammonium carbonate and magnesium chloride. (iii) Write the difference between atom and molecule.

Answer»

Solution :(i) Molar mass of `Al(OH)_(3)`
`= 27 + 3 [1 xx 16 + 3(1)]`
= 27 + 3(16 + 3)
= 27 + 3(19)
= 27 + 57
= 84 G
(ii) Ammonium carbonate : `(NH_(4))_(2)CO_(3)`
Magnesium chloride : `MgCl_(2`
(iii) An atom is the SMALLEST particle of an ELEMENT which may or may not have independent existence. A molecule is the smallest particle of an element or a COMPOUND which have independent existence.


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