A 54g sample of carbon combines with 13g of Oxygen to for Carbon dioxide. a) what is the mass of the reactants? b) what is the mass of the products? c) How do you know? What data or process did you use to find your answer? Please help

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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.