A chemist prepares a solution of sodium nitrate (NaNO3) by measuring out 2.19x10^2 umol of sodium nitrate into a 500. mL volumetric flask and filling the flask to the mark with water.
Calculate the concentration in mmol/L of the chemist's sodium nitrate solution. Be sure your answer has the correct number of significant digits.
mmol

28. which is not a reason that water is used to store spent fuel rods from nuclear power plants? water increases the speed of the chain reaction in the fuel rods. water protects nuclear power plant workers from the high temperature and radiation of the fuel rods. water acts as a radiation shield to reduce the radiation levels. water cools the spent rods. salts action