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JEE Main Chemistry question

ChemistrySome Basic Concepts of ChemistryJEE Main

A preweighted vessel was filled with at STP and weighed. It was then evacuated, filled with at the same temperature and pressure, and again weighed. The weight of the will be

Answer: (D)

Solution

At the same , both gases contain the same number of moles, so the mass of each is proportional to its molar mass:

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Question ID VK-134076