JEE Main 2005 Chemistry question

If we consider that , in place of ; mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

(1)Decrease twice
(2)Increase two fold
(3)Remain unchangedCorrect
(4)Be a function of the molecular mass of the substance

Answer: (3)

Solution

Changing the atomic mass unit changes only the numerical relative masses (they would all halve), but a mole is still a fixed number of particles (Avogadro's number

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Question ID VK-038590