MHT CET202525 Apr 2025Morning ShiftChemistrySome Basic Concepts of ChemistryActual
The vapour density of a certain gas is 16. What is the volume occupied by 8 g of gas at STP assuming ideal behaviour?
Options
- A2.80 ~dm ^3
- B5.6 ~dm ^3
- C11.2 ~dm ^3
- D2 24 ~dm ^3
Correct answer
B. 5.6 ~dm ^3
Step-by-step solution
Vapour density (VD) relates to molar mass via M = 2 VD . Given VD = 16 , the molar mass is M = 2 16 = 32 g/mol . For a mass of 8 g , the number of moles is n = 8 32 = 0.25 mol . At STP, one mole occupies 22.4 dm ^3 , so 0.25 mol occupies 0.25 22.4 = 5.6 dm ^3 . The volume is 5.6 dm ^3 , corresponding to option B .