Calculate the molar mass of the following substances Question 6 from Chapter 3. Atoms And Molecules

(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) Molar Mass of Ethyne, C₂H₂; =     2 × 12 + 2 × 1 =  26 g

(b) Molar Mass of Sulphur molecule, S₈ =   8 × 32  =  256 g

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

(d) Molar Mass of Hydrochloric acid, HCl  =   1 + 35.5 =  36.5 g

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

This is an answered question from Chapter 3. Atoms And Molecules of CBSE Class 9th Science

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