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

Q: 1 Calculate the molecular mass of the following:

(i) Equation

(ii) Equation

(iii) Equation

Answer:

(i) Equation

The molecular mass of water, Equation Equation

Equation

Equation

Equation

Equation

(ii) Equation

The molecular mass of carbon dioxide, Equation

Equation

Equation

Equation

Equation

(iii) Equation

The molecular mass of methane, Equation

= Equation

Equation

Equation

Equation

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

Answer:

The molecular formula of sodium sulphate is Equation

Molar mass of Equation

Equation

Mass percent of an element Equation

∴ Mass percent of sodium:

Equation

Equation

Equation

Mass percent of sulphur:

Equation

Equation

Equation

Mass percent of oxygen:

Equation

Equation

Equation

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