What is the number of moles of iron atoms in 19.2 grams of iron (II) oxide?

What is the number of moles of iron atoms in 19.2 grams of iron (II) oxide?

O=16g
Fe=56g

1 Answer
Shreya
Feb 22, 2018

1 molecule of Fe_2O_3 contains 2 atoms of iron.
Thus, 1 mole of Fe_2O_3 has 2xxN_A no. of iron atoms.
Molar mass of Fe_2O_3 is 160 gm.
Thus,1 gm of this compound has (2xxN_A)//160 no. of Fe atoms.
19.2 gm of Fe_2O_3 has (2xxN_Axx19.2)//160 or 1.45xx10^23 no of Fe atoms.

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