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half equation problems!!?

Cr2O4 2- ---> 2CO2 +2e-

can someone please explain why there are 2 electrons and not one?//

1 Answer

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  • Mike A
    Lv 7
    4 years ago

    The negative charges have to balance just like the numbers of each element. You have two -ve charges on the left so you need two on the right.

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