Which of the following statements is true about the decomposition of a simple binary compound?
A. The products are unpredictable.
B. The reactants are the constituent elements.
C. The reactant is a single substance.
D. The product could be an ionic or a molecular compound.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.