Question

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

  • atoms and molecules CBSE Class 9
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Answer

(a) Molar mass of ethyne, C2H2                         = 2 × 12 + 2 × 1 = 28g

(b) Molar mass of sulphur molecule, S8        = 8 × 32 = 256g

(c) Molar mass of phosphorus molecule, P4 = 4 × 31 = 124g

(d) Molar mass of hydrochloric acid, HCl     = 1 + 35.5 = 36.5g

(e) Molar mass of nitric acid, HNO3             = 1 + 14 + 3 × 16 = 63g

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