In 1993 the minnesota department of health set a health risk limit for 1,2-dibromoethane in groundwater of 4.00ng/l . suppose an analytical chemist receives a sample of groundwater with a measured volume of 81.0 ml. calculate the maximum mass in milligrams of 1,2-dibromoethane which the chemist could measure in this sample and still certify that the groundwater from which it came met minnesota department of health standards. round your answer to significant digits.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

c, liquids evaporate, creating a gas