Cr2O72-(aq)+Cu(s)→Cr3+(aq)+Cu2+(aq) balance this equation. then Determine the volume of a 0.900 M K2Cr2O7 solution required to completely react with 3.93 g of Cu.

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explanation:

the answer is a and have a great day

  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-

since electrons are negative the answer is neagtaive