1. Write one "Introduction tweet" (280 characters or less, including spaces) that explains to your audience why they should care about whether the U. S. Mint specifications give the correct density. 2. Write 1-2 "Methods Tweet" that explains to your audience (briefly) what you did and why your measurements of volume and mass were able to give you the density.

How many moles of al3+ ions are in 1.25 moles of al2o3

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.

16. in a reaction that has reached equilibrium, a. the forward and reverse reactions are occurring at the same rate. b. the reactants and products are in equal concentrations. c. the forward reaction has gone further than the reverse reaction. d. there are equal numbers of atoms on both sides of the equation. e. a, b, and d are correct.