Question

Write down the formulae and calculate the mass of following compounds [10]

{ Mg = 24 ; Na = 23 ; S = 32 ; O = 16 ; H = 1 ; Al = 27; Cl = 35.5 ; N = 14}

(i) sodium sulphate (ii) aluminium chloride (iii) sodium sulphide (iv) magnesium hydroxide

(v) ammonium sulphate.



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Answer 1

Answer:

See below your answer with explanation.

Explanation:

(1) Sodium sulphate- Na₂SO₄- 23*2+32+16*4- 46+32+64- 142u

(2) Aluminium chloride- AlCl₃- 27+35.5*3- 133.5u

(3)Sodium sulphide -Na₂S- 23*2+32- 98u

(4)Magnesium hydroxide- Mg(OH)₂- 24+17*2- 24+34- 58u

(5) Ammonium sulphate.- Al₂(SO₄)₃- 27*2+96*3-342u

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