What is the mass of one mole of beryllium if the atomic mass of beryllium is 9.01? 9.01 amu 9.01 mg 9.01 g 9.01 kg

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.

How many moles are contained in 5.6 l of h2 at stp