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Balance the following chemical equations...

Balance the following chemical equations.
(i) `NH_(3)+Br_(2)toN_(2)+NH_(4)Br`
(ii) `FeS_(2)+O_(2)toFe_(2)O_(3)toSO_(2)`

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(i) `NH_(3)+O_(2)toNO+H_(2)O`
`4NH_(3)+5O_(2)to4NO+6H_(2)O`
(ii) `FeS_(2)+O_(2)toFe_(2)O_(3)+SO_(2)`
`4FeS_(2)+11O_(2)to2Fe_(2)O_(3)+8SO_(2)`
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