Asolution is 40% acetic acid by mass. the density of this solution is 1.049 g/ml. calculate the mass of pure acetic acid in 400 ml of this solution at 20 c.

Reaction rate depends on how many molecules are coming into contact with each other with enough energy to react. increasing the temperature of the reactants will increase -

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

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.