Which of the following contains minimum number of molecules?(i) 46 g o – InterviewSolution

1.	Which of the following contains minimum number of molecules?(i) 46 g of ethyl alcohol(ii) 54 g of nitrogen pentaoxide
Answer» (i) Molar mass of ethyl alcohol (C₂H₅OH) is 46 g/mol So, 46 g of ethyl alcohol will have 6.023 × 10²³molecules, (ii) Molar mass of nitrogen pentaoxide (N₂O₅) is 108 g/mol So, 54 g of N₂O₅will contain 1/ 2 mole i.e., 6.023 × 10²³ × (1/2) molecules. = 3.0115 × 10²³ molecules Hence, 54 g of nitrogen pentaoxide will have minimum number of molecules.

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