Determine the mass of copper that has the same number of atoms as there are in 8.47 mg of potassium. Answer in units of mg.

For the following, determine the type of reaction and then give products.

Which compound contain an iron with a 3+ charge

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.