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Solution


Q.

The highest number of helium atoms is in                 [2024]
1 4 mol of helium  
2 4 u of helium  
3 4 g of helium  
4 2.271098 L of helium at STP  

Ans.

(1)

4 mol of helium =4×NA atoms

4 u of helium = 1 atom

4 g of helium = 1 mol = NA atoms

2.271098 L of helium =2.27109822.7mol = 0.1 mol = 0.1 NA atoms