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Calculate the molar mass of the following substances. (a) Eth... - Science
Question
Calculate the molar mass of the following substances.
(a) Ethyne, \text{C}_2\text{H}_2
(b) Sulphur molecule, \text{S}_8
(c) Phosphorus molecule, \text{P}_4 (Atomic mass of phosphorus = 31)
(d) Hydrochloric acid, HCl
(e) Nitric acid, \text{HNO}_3
Answer
(a) Ethyne, \text{C}_2\text{H}_2:= (2 \times 12) + (2 \times 1) = 24 + 2 = \mathbf{26 \text{ g/mol}}
(b) Sulphur molecule, \text{S}_8:= 8 \times 32 = \mathbf{256 \text{ g/mol}}
(c) Phosphorus molecule, \text{P}_4:= 4 \times 31 = \mathbf{124 \text{ g/mol}}
(d) Hydrochloric acid, HCl:
= 1 + 35.5 = \mathbf{36.5 \text{ g/mol}}
(e) Nitric acid, \text{HNO}_3:= 1 + 14 + (3 \times 16) = 1 + 14 + 48 = \mathbf{63 \text{ g/mol}}