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Balance the following:
$\ Fe\ +\ O_{2}\rightarrow \ Fe_{2} O_{3} \ $
1>$\ Fe\ +\ O_{2}\rightarrow \ Fe_{2} O_{3} \ $
In order to balance chemical equations, one has to balance all the atoms on the left and right side of the arrow.
In the equation $\ Fe\ +\ O_{2}\rightarrow \ Fe_{2} O_{3} \ $
left side : Fe = 1 right side of arrow: Fe=2
O =2 O=3
In order to balance Oxygen, multiply the left side by 3 and right side by 2 to get 6 oxygen atoms on both sides.
left side : Fe = 1 right side of arrow: Fe=2*2=4
O =2*3=6 O=3*2=6
In order to balance Fe on both sides, Multiply Fe by 4 on the left side.
left side : Fe = 1*4 = 4 right side of arrow: Fe =4
O =6 O = 6
Hence, the balanced chemical equation is:
$4\ Fe+\ 3O_{2}\rightarrow 2\ Fe_{2} O_{3}$
Iron + Oxygen--> Hematite  
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