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mass of iron = 6g mass of iron oxide = 8.57g mass of oxygen = mass of iron oxide

ID: 700566 • Letter: M

Question

mass of iron    = 6g

mass of iron oxide   = 8.57g

mass of oxygen   = mass of iron oxide-mass of iron

                           = 8.57 -6    = 2.57g

Element           mass of element    A.wt            no of moles                      simple ratio            simplest ratio

Fe                         6                                55.85               6/55.85   = 0.107          0.107/0.107 = 1           1*2 = 2

O                         2.57                            16                   2.57/16   = 0.16            0.16/0.107   = 1.5          1.5*2 = 3

             The empirical formula    Fe2O3

The chemical reaction between iron and oxygen to gives Fe2O3

4Fe + 3O2 --------------------> 2Fe2O3

Explanation / Answer

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