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Use the oxidation number method to balance the equation below. What is the coefficient of PbO...

Use the oxidation number method to balance the equation below. What is the coefficient of PbO in the equation balanced with the smallest set of coefficients?

__PbO(s) + __PH3(aq) =>__P4(g) + __H2O(l) + __Pb(s) Answer should be 6, I got 3. I tried doing it by balancing the waters and electrons, but I'm off.

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