Friday, 5 January 2018

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

Check for Complete Exercise Solution for Chapter 3. Atoms And Molecules | CBSE Class 9th Science

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