Who will tell me in detail how to calculate the chemical price with chemical formula?

When calculating chemical valence, the first group to be distinguished, such as ammonium sulfate (NH4)2SO4, is composed of ammonium ion NH4^+ and sulfate ion SO4 2-. When calculating the valence, remember that the valence of H and O in any compound is fixed except that the valence of H2 and O2 is zero: H is+1 and O is zero. The total valence of all compounds is zero.

For example, x represents the valence of n and y represents the valence of s;

0 = 2(x+ 1 * 4)+y+4(-2)y+2x = 0y =-2x

At the same time, according to the sulfate radical, we know that y+ 4(-2) =-2 y=-2-4(-2) = -2+8=+6 generations return to the above formula Y =-2 X.

6=- 2 x x =6/-2=-3

So the valence of sulfur in (NH4)2SO4 is +6, and the valence of n is -3.

Sulfur also has a valence of +4, such as sulfur dioxide SO2；; Zero price, such as sulfur.

Nitrogen n has zero valence, such as nitrogen N2; Divalent, nitric oxide NO; Tetravalent, nitrogen dioxide NO2；; Pentavalent nitric acid.