In each case, 10.00 mL of the sample solution and 15.00 mL of an organic additive were added to a series of five 50 mL volumetric flasks. The standard Eu(III) or Tb(III) solution (0, 5.00, 10.00, 15.00, and 20.00 mL) was then added to the flasks and they were diluted to 50.0 mL with water. The Eu(III) standards added to the groundwater sample contained 0.185 ng/mL (ppb) of Eu(III). Calculate the concentration of Eu(III) in the groundwater sample.

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption

These questions are based on the attached photo. the experiment is about burning magnesium metal with oxygen. 1. write the balanced chemical equation for the reaction you are performing. 2. calculate the mass of magnesium metal used in each trial. o trial 1: o trial 2: 3. calculate the actual yield of magnesium oxide for each trial. o trial 1: o trial 2: 4. magnesium is the limiting reactant in this experiment. calculate the theoretical yield of mgo for each trial. o trial 1: o trial 2: 5. determine the percent yield of mgo for your experiment for each trial. o trial 1: o trial 2: 6. determine the average percent yield of mgo for the two trials. your company currently uses a process with a similar cost of materials that has an average percent yield of 91 percent. if the average percent yield of this process is higher than that, this could save the company money. what is your recommendation to the company? support your recommendation using your data, calculations, and understanding of stoichiometry gathered from this lab.

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation: