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valina [46]
3 years ago
15

2. State one difference between gas and vapour. Which of the following substance in the gaseous state should be called a vapour?

(i) Helium
(ii) Nitrogen (iii) Sulphur (iv) Carbon dioxide.
Chemistry
1 answer:
Neporo4naja [7]3 years ago
3 0
Difference between Gas and Vapour:
                                                          
Gas:
        A thermodynamic state in which a substance exists only in one phase i.e. Gas phase. In above given examples N₂, He and CO₂ exists as gases at room temperature. These gases cannot form a solid or liquid phase along with gas phase as these states requires very low temperatures.

Vapours:
               It is a thermodyanamic state in which a substance exists in more than one phase. In given options Sulfur can exist in vapor state. This is because sulfur exists in a cyclic or chain form due to catenation (self linkage property). Therefore, a lower members of S allotrops can form a vapours.
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