For the oxidation-reduction reaction equation given here, 4Ga + P_4 right arrow

Question

For the oxidation-reduction reaction equation given here, 4Ga + P_4 right arrow 4GaP indicate how many electrons are transferred in the formation of one formula unit of product. Both reactants are neutral elements, and so they both have oxidation states of zero. The product is an ionic compound, so each element in the products has an oxidation state equal to its ion charge. Recall that elements from groups 1A, 2A, and 3A tend to form +1, +2, and +3 ions respectively, and elements from groups 5A, 6A, and 7A tend to form - 3, - 2, and - 1 ions respectively.

Explanation / Answer

1 electron is transferred in the formation of one formula unit product

4 Ga --> 4 Ga+ + 4 e-

P4 + 4 e- --> 4 P-

4 Ga+ + 4 P- --> 4 GaP             

4 electrons for 4 formula units, hence 1 electron for 1 formula unit

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