Astudent based the analysis of cu(ii) in a sample on the formation of the blue complex [cu(h2o)6]+2. a standard solution was made when 1.432 g of pure copper wire (mm= 63.546g/mol) was weighed, dissolved in concentrated hno3, and diluted to 1.00x102 ml. the stock solution was used to make a dilution by mixing 6.00 ml of stock solution with 44.0 ml of deionized water. colorimetric determination gave that the absorbance of the sample was 0.07525 when the path length of the light through the solution was exactly 1 cm. calculate the transmittance of the solution.

  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-