Q.

Number of atoms in 558.5 gram Fe (at.wt of Fe=55.85 g mol–1) is

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a

Twice that in 60 g carbon

b

6.023×1022

c

Half that in 8g He

d

558.6×6.023×1023

answer is A.

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Detailed Solution

GAW of Fe = 55.85g55.85g of Fe contain NA atoms558.5g of Fe contain 'X' atomsX = 10NAOption (1)12g 'C' contain NA atoms60g 'C' contain 'X1' atomsX1 = 5NA atomsOption (2)6.023 x 1022Option (3)4g of He contain NA atoms8g of He contain 'X2' atomsX2 = 2NA atomsOption (4)558.6 x 6.023 x 1022 atom558.5g of Fe contain 10NA atoms which are twice the atoms as present in 60g of 'C'(5NA)
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Number of atoms in 558.5 gram Fe (at.wt of Fe=55.85 g mol–1) is