Chemistry Class 11 NCERT Solutions: Chapter 1 Some Basic Concepts of Chemistry Part 1

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Q: 1 Calculate the molecular mass of the following:

Example of molecular mass for carbon dioxide

Structure of Molecular Mass


Molecular Atomic mass of 2 hydrogen + 1 oxygen

Structure of Molecular Mass of H2O


Molecular Atomic mass of 1 carbon +2 oxygen

Structure of Molecular Mass of CO2


Molecular Atomic mass of 1 carbon + 4 hydrogen

Structure of Molecular Mass CH4



The molecular mass of water,


The molecular mass of carbon dioxide,


The molecular mass of methane,


Q: 2 calculate the mass percent of different elements present in sodium sulphate

Na2SO4 is a typical ionic sulfate, containing Na+ ions and S …

Structure of Sodium Sulphate Na2SO4

This Structure is sodium hydroxide and copper sulfate and So …

Structure of Sodium Sulphate


The molecular formula of sodium sulphate is

Molar mass of

Mass percent of an element

∴ Mass percent of sodium:

Mass percent of sulphur:

Mass percent of oxygen:

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