Given that the molecular mass of iron is 56 and that of oxygen is 16, how many moles of iron(iii)oxide will be contained in 1kg of the compound?
a
25.0 moles
b
12.5 moless
c
6.25 moles
d
3.125 moles
e
0.625 moles
Explanation
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Stephanieobiefuna
3 years ago
Iron(iii) oxide=Fe2O3
Mass of Fe2O3=(56×2)+(16×3)
=160g
Therefore, 1 mole=160g
x moles=1kg(1000 grams)
x moles=(1000×1)/160
=6.25 moles
