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Answer: Calculate the molar mass of: (a) Ethyne (b) Sulphur molecule (c) Phosphorus molecule (d) Hydrochloric acid (e) Nitric acid
(a) Chemical formula of Ethyne C2H2
Molar mass of ethyne = 2 x 12 + 2 x 1
Molar mass of ethyne = 26 g
(b) Chemical formula of Sulphur molecule S8
Molar mass of sulphur molecule = 8 x 32 = 256 g
(c) Chemical formula of Phosphorus molecule, P4 (atomic mass of phosphorus = 31)
Molar mass of phosphorus molecule = 4 x 31 = 124 g
(d) Chemical formula of Hydrochloric acid HCl
Molar mass of hydrochloric acid = 1 + 35.5 = 36.5 g
(e) Chemical formula of Nitric acid HNO3
Molar mass of nitric acid = 1 + 14 + 3 x 16 = 63 g
