Balance the following equations by ion electron (half reaction) method for each of the following equations:
`Cr_(2)O_(7)^(2-) + Fe^(2+) rarr cr^(3+) + Fe^(3+) + H_(2)O`

Explanation

For equation multiplied with 6 and `Cr_(2)O_(7)^(2-)` equation multiplied with 1
`6Fe^(2+) + overset(+6)(Cr_(2)O_(7)^(2-)) to 6Fe^(3+) + 2Cr^(3+)`
Balance all the atoms other than O and H.
`6Fe^(2+) + Cr_(2)O_(7)^(2-) to 6Fe^(3+)+2Cr^(3+)`
Balance the O by adding `H_(2)O` molecule.
`6Fe^(2+) + Cr_(2)O_(7)^(2-) + 14H^(+) to 6Fe^(3+) + 2Cr^(3+) + 7H_(2)O`