Question

The gases chlorine, nitrogen, ammonia and sulphur dioxide are collected under the same conditions of temperature and pressure. If 20 litres of nitrogen contain ‘X’ no. of molecules state the no. of molecules in 10 litres of chlorine, 20 litres of ammonia and 5 litres of sulphur dioxide, (x/2, x, x/4).

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Gas	Volume milliliters	Number of molecules
Chlorine	10	0x/2
Nitrogen	20	x
Ammonia	20	x
Sulphur dioxide	5	x/4

Answer 1

This is because of Avogadro's laws which states' Equal volumes of all gases, under similar conditions of temperature and pressure, contain equal number of molecules.

∴ 20 lit. nitrogen contains x molecules

∴ 10 lit. of chlorine will contain x *10/20 = x/2 mol.

and 20 lit of Ammonia will also contain = x molecules and 5 lit. of SO2 will contain 

= x *5/20 = x/4 = mol.