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JEE Main Chemistry question

ChemistrySome Basic Concepts of ChemistryJEE Main

A flask of methane () was weighed. The methane was then pushed out and the flask was again weighed when filled with oxygen at the same temperature and pressure. The mass of oxygen would be:

Answer: (C)

Solution

The same flask at the same holds the same number of moles of gas regardless of identity. Since $

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Question ID VK-134462