Question
Calculate the molar mass of the following substances: [5 MARKS]
(a) Ethyne, C2H2
(b) Sulphur molecule, S8
(c) Phosphorus molecule, P4 (atomic mass of phosphorus = 31)
(d) Hydrochloric acid, HCl
(e) Nitric acid, HNO3
(a) Ethyne, C2H2
(b) Sulphur molecule, S8
(c) Phosphorus molecule, P4 (atomic mass of phosphorus = 31)
(d) Hydrochloric acid, HCl
(e) Nitric acid, HNO3
Answer:
:
Each point: 1 Mark
(a) Ethyne, C2H2
Molar mass of ethyne, C2H2 = 2 x 12 + 2 x 1 = 26 g
(b) Sulphur molecule, S8
Molar mass of sulphur molecule, S8 = 8 x 32 = 256 g
(c) Phosphorus molecule, P4 (atomic mass of phosphorus = 31)
Molar mass of phosphorus molecule, P4 = 4 x 31 = 124 g
(d) Hydrochloric acid, HCl
Molar mass of hydrochloric acid, HCl = 1 + 35.5 = 36.5 g
(e) Nitric acid, HNO3
Molar mass of nitric acid, HNO3 = 1 + 14 + 3 x 16 = 63 g
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:
Each point: 1 Mark
(a) Ethyne, C2H2
Molar mass of ethyne, C2H2 = 2 x 12 + 2 x 1 = 26 g
(b) Sulphur molecule, S8
Molar mass of sulphur molecule, S8 = 8 x 32 = 256 g
(c) Phosphorus molecule, P4 (atomic mass of phosphorus = 31)
Molar mass of phosphorus molecule, P4 = 4 x 31 = 124 g
(d) Hydrochloric acid, HCl
Molar mass of hydrochloric acid, HCl = 1 + 35.5 = 36.5 g
(e) Nitric acid, HNO3
Molar mass of nitric acid, HNO3 = 1 + 14 + 3 x 16 = 63 g
Was this answer helpful ?
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