Question

Give the chemical formulae for the following compounds and compute the ratio by mass of the combining elements in each one of them. (You may use appendix-III).

1. Ammonia
2. Carbon monoxide
3. (Hydrogen chloride
4. Aluminium fluoride
5. Magnesium sulphide

Answer 1

	Chemical formula	Ratio by mass
(a)	Ammonia (NH3)	N(I) : H(3) 14 : 3
(b)	Carbon monoxide (CO)	C(1) : O(1) 12 : 16 or 3 : 4
(c)	Hydrogen chloride (HCl)	H(1) : Cl(I)1 : 23.5 or 2 : 71
(d)	Aluminium fluoride (AlF3)	Al(1) : F(3) 27 : 19 × 3 or 9 : 19
(e)	Magnesium sulphide (MgS)	Mg(1) : S(1) 24 : 32 or 3 : 4