The balanced chemical equation for the reaction between SF4 and H2O is:

SF4 + 2H2O → H2SO4 + 4HF

The coefficients in the balanced equation are:

SF4: 1

H2O: 2

H2SO4: 1

HF: 4

The sum of the coefficients is 1 + 2 + 1 + 4 = 8.