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

Q: 33. Calculate the number of atoms in each of the following

Equation

Equation

(iii) Equation

Answer:

(i) Equation

Equation

Equation

(ii) Equation

Or,

Equation

Equation

Equation

Equation

(iii) Equation

Equation

Equation

Q: 34. A welding fuel gas contains carbon and hydrogen only. Burning a small sample of it in oxygen gives Equation carbon dioxide, Equation of water and no other products. A volume of Equation (measured at STP) of this welding gas is found to weigh Equation Calculate

(i) Empirical formula

(ii) Molar mass of the gas

(iii) Molecular formula

Answer:

(i) Equation

Equation

Equation

Equation of water contains 2 g of hydrogen.

Equation

Equation

Since carbon and hydrogen are the only constituents of the compound, the total mass of the compound is:

Equation

Equation

Equation

Equation

Percent of H in the compound Equation

Equation

Moles of carbon in the compound Equation

Equation

Moles of hydrogen in the compound Equation

Equation

Equation

= 1: 1

Hence, the empirical formula of the gas is CH.

(ii) Given

Weight of Equation of gas Equation

Equation

Equation

Equation

Hence, the molar mass of the gas is Equation

(iii) Empirical formula mass of Equation

Equation

Equation

Equation

Equation

Equation

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