what mass, in grams, of KClO3 is consumed when 38 grams of O2 is produced according to the following rxn: KClO3= O2+ KCl? What do I do to solve it don't give an answer just the equation or explain how to solve it

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.

In science class richard learns that a substance has a boiling point of 230 fahrenheit his teacher ask him to convert this temperature to degrees celsius what is the boiling point of his substance in degrees celsius

What prefix multiplier is appropriate for reporting a measurement of 5.57 ×10−5 m?