1.

Calculate the molar mass of the following substances.(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»

(a) Ethyne C2H2
Molar Mass = 2 × 12 + 2 × 1
= 24 + 2
= 26 g.
(b) Molar mass of Sulphur molecule
= 8 × 32
= 256 g.
(c) Molar Mass of Phosphorus molecule
= 4 × 31
(Atomic mass of Phosphorus)
= 124 g.
(d) Molar mass of Hydrochloric acid
= HCl
= 1 + 35.5
= 36.5 g.
(e) Molar mass of HNO3
= 1 + 14 + 3 × 16
= 15 + 48
= 63 gm.


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