Which of the following conclusions can be drawn from the curves in the energy diagram? The reaction represented by curve B has a larger equilibrium constant than curve A.
The molecules represented in curve A is due to a catalyst.
The reaction represented by curve B is due to a catalyst.
The reaction represented by curve A requires less added energy than curve B.

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.