Posted by **James** on Thursday, April 24, 2008 at 8:53pm.

i put 1 for the spaces before both of the Fes and got them both wrong but i got the others right. thank you

Balance the equation:

Note: If a chemical species coefficient is "1" then "1" needs to be entered in the field before that species.

1 MnO4– + 8H+ +__ Fe2+ -->1Mn2+ + 4H2O + __Fe3+

- Chemistry -- to Dr.Bob -
**kelly**, Thursday, April 24, 2008 at 9:30pm
put 6 before Fe2+ and Fe3+

- Chemistry -- to Dr.Bob -
**James**, Thursday, April 24, 2008 at 10:54pm
wait why is it 6?

- Chemistry -- to Dr.Bob -
**kelly**, Thursday, April 24, 2008 at 11:43pm
because its a redox reaction. the number of electrons in the Fe2+ to Fe3+ half-equation must equal the number of electrons in the MnO4 to Mn2+ half-equation, which is 6. Thus you need to have 6 Fe2+ and 6 Fe3+ also.

Balance each half-equation first, and then combine the 2. :)

- Chemistry -- to Dr.Bob -
**DrBob222**, Thursday, April 24, 2008 at 11:40pm
Mn changes from +7 on the left to +2 on the right.

Fe changes from +2 on the left to +3 on the right.

Therefore, place a 5 for both Fe on the left and right. The others are ok.

- Chemistry -- to Dr.Bob -
**UCI kid**, Monday, April 28, 2008 at 5:10pm
don't put 6. it's wrong in webwork

- Chemistry -- to Dr.Bob -
**Aly**, Monday, April 27, 2009 at 3:19pm
Put 5 before Fe2+ and before Fe3+

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