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Class 12th Chemistry 2018 Set1 Delhi Board Paper Solution

Question 12

An element 'X' (At. mass = 40g mol-1) haveing f.c.c. structure, has unit cell edge length of 400 pm. Calculate the density of 'X' and the number of unit cells in 4 g of 'X' . (NA = 6.022 X 1023 mol-1) 

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