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
jamb 1985chemistry

The correct answer is C. 6.25 moles

Fe2O3 = 56 x 2 + 48 = 160 = 1 moles

1000gm will contain \(\frac{1000}{160}\) = 6.25 moles

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