Question

Determine the molecular formula of an oxide of iron

Answer 1

Answer:

Determine the molecular formula of an oxide of iron in which the mass per cent of iron and oxygen are 69.9 and 30.1 respectively.Given that the molar mass of the oxide is 159.69 g mol. ∴ The empirical formula of the iron oxide is Fe2O3

Answer 2

Answer:

Atomic mass of iron = 55.85 amu

Atomic mass of oxygen = 16.00 amu

Relative moles of iron in iron oxide = %mass of iron by mass/Atomic mass of iron = 69.9/55.85 = 1.25