What is number of atoms present in 2.24 dm^3 NH_ 3(g) at STP?

MHT CET 2023 Chemistry question

What is number of atoms present in 2.24 dm NH at STP?

(A)
(B)Correct
(C)
(D)

Answer: (B)

Solution

At STP one mole of an ideal gas occupies 22.4 dm, so 2.24 dm of NH is 0.1 mol, i.e. molecules. Each NH molecule has 4 atoms (1 N + 3 H), so the number of atoms

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Question ID VK-098331