Solve the following Stoichiometry problems using the balanced reaction below: 4Al + 3O2 → 2Al2O3 (the numbers at the end of the element or compound are supposed to be subscripts Ex: in the reactant 302 3 is a coefficient, O is Oxygen, and 2 is the subscript for oxygen) Determine the mole ratio of oxygen, O2 to Aluminum Oxide, Al2O3? *

Compare and contrast physical changes with chemical changes.

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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.