*** what is the answer of this equation

But... what is the question? :confused:

solve this equation
CO2 + H2O + Cr2H7O9 = ?

Are you sure that Cr_2H_7O_9 exist?

In this compound, the oxidation states of H and O must be +1 and -2 respectively, giving +7-18 = -11

Which also means that Cr must have an oxidation state of 11/2 = +5.5 which I don't think is possible... unless you mean:

[Cr_2O_7 \cdot 2(H_2O)]^{2-}

But there is not the same number of H atoms...

And also, the chromate ion is an oxidant. Neither carbon dioxide and water can be oxidised as far as I know. So, I guess there will be no reaction.

Thank youuuuuuuuuuuuu a lot for your wonderful info ^^!.
my doctor has just sent me a message that it's a wrong equation.. =]
thanks again =]]

Uh... that was for medication? 0.o

Yupii..