Number of atoms in 560 g of Fe (atomic mass 56 g mol -1 ) is:

Question

Number of atoms in 560 g of Fe (atomic mass 56 g mol -1 ) is: (A) twice that of 70 g N (B) half that of 20 g H (C) both (a) and (b) (D) none of the above

Tardigrade Admin · Accepted Answer

560 g of Fe No. of moles =(560 g /56 g )=10 mole 70 g of N 14 g =1 mole of N 70 g =5 moles of N 20 g H =20 moles of H -atoms

Q. Number of atoms in $560 g$ of Fe (atomic mass $56 g m o l^{- 1}$ ) is:

twice that of $70 g N$

half that of $20 g H$

both (a) and (b)

none of the above

$560 g$ of $F e$

No. of moles $= \frac{560 g}{56 g} = 10 m o l e$

$70 g$ of $N$

$14 g = 1 m o l e$ of $N$

$70 g = 5 m o l es$ of $N$

$20 g H = 20 m o l es$ of $H$ -atoms

Q. Number of atoms in 560g of Fe (atomic mass 56gmol−1 ) is:

twice that of 70gN

half that of 20gH