Zero
O.S. of H = +1 O.S. of O = -2 O.N. of cpd = 0
The sum of oxidation numbers in a neutral compound is always zero, as the charges balance out. In polyatomic ions, the sum of oxidation numbers equals the charge of the ion. When determining oxidation numbers, rules such as assigning elements in their elemental state an oxidation number of zero and hydrogen an oxidation number of +1 are typically followed.
For a neutral molecule it is zero, for polyatomic ions the sum is the same as the ionic charge.
The sum of the oxidation numbers for P2O5 is zero. In P2O5, the oxidation number for phosphorus is +5, and each oxygen atom has an oxidation number of -2. Since there are five oxygen atoms, the total sum of the oxidation numbers is 2(+5) + 5(-2) = 0.
In a neutral compound, the sum of the oxidation numbers of the atoms in the compound is zero.
The sum of oxidation numbers in an uncharged molecule will be 0.For example, H2O has O2- and 2H+.1(-2) + 2(+1)=0The sum of oxidation numbers in a charged species will equal the charge.For example, HCO3- has H+, C4+, and 3O2-.1(+1) + 1(+4) + 3(-2) = -1
The sum of the oxidation numbers in a neutral compound is equal to zero. This is because in a neutral compound, the total positive oxidation numbers are balanced by the total negative oxidation numbers to give a net charge of zero.
The sum of the oxidation numbers in a compound is zero for a neutral compound. This is because the total positive oxidation numbers from the cations must equal the total negative oxidation numbers from the anions to balance out and form a neutral compound.
The sum of the oxidation numbers in the phosphate ion (PO4^3-) is -3. Each oxygen atom has an oxidation number of -2, totaling -8. The oxidation number for phosphorus is +5 to offset the oxygen atoms and give a total charge of -3 for the ion.
The sum of oxidation numbers in a neutral compound is always zero. (Note that in order for this to be true, the oxidation number of each type of atom present must by multiplied by the number of such atoms present in the formula unit for the compound before the addition is performed.)
The sum of the oxidation numbers in a neutral compound is always zero. This is because the total charge of the compound is zero, so the sum of the oxidation numbers of the individual elements must also add up to zero.
The oxidation number of an atom in its elemental form is 0. In a compound, the sum of oxidation numbers must equal the overall charge of the compound. In a polyatomic ion, the sum of oxidation numbers must equal the charge of the ion. Some elements have fixed oxidation numbers (e.g., alkali metals +1, alkaline earth metals +2).