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JEE Main Chemistry question

ChemistryThe Solid StateJEE Main

Not in JEE Main or NEET syllabus

A crystalline solid of a pure substance has an fcc structure with a cell edge of 400 pm. If the density of the substance in the crystal is 8 g cm, then the number of atoms present in 256 g of the crystal is . The value of is .

Answer: 24

Solution

As in the equivalent JEE Advanced 2017 problem, . Moles in 256 g

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Question ID VK-141844