Calculate the molecular mass of the following, ncert solutions class 11 chemistry chapter 1 Chapter 1: Some Basic Concepts of Chemistry Chemistry Class 11 solutions are developed for assisting understudies with working on their score and increase knowledge of the subjects. Question 1: Calculate the molecular mass of the following: (i) H2O (ii) CO2 (iii) CH4 is solved by our expert teachers. You can get ncert solutions and notes for class 11 chapter 1 absolutely free. NCERT Solutions for class 11 Chemistry Chapter 1: Some Basic Concepts of Chemistry is very essencial for getting good marks in CBSE Board examinations
Answer
(i) H2O
The molecular mass of water, H2O
= (2 × Atomic mass of hydrogen) + (1 × Atomic mass of oxygen)
Use Appendix II of NCERT book at page 232
= [2(1.0079) + 1(16.00)]
= 2.016 + 16.00
= 18.016
Approximate the value
= 18.02 amu
(ii) CO2
The molecular mass of carbon dioxide, CO2
= (1 × Atomic mass of carbon) + (2 × Atomic mass of oxygen)
Use Appendix II of NCERT book at page 232
= [1(12.01 ) + 2 (16.00 )]
= 12.01 + 32.00
= 44.01 amu
(iii) CH4
The molecular mass of methane, CH4
= (1 × Atomic mass of carbon) + (4 × Atomic mass of hydrogen)
Use Appendix II of NCERT book at page 232
= [1(12.01) + 4 (1.0079 )]
= 12.01 + 4.032
= 16.04 amu
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