In fireworks, the heat of the reaction of an oxidizing agent, such as kclo4, with an organic compound excites certain salts, which emit specific colors. strontium salts have an intense emission at 641 nm. what is the energy (in kj) of this emission for 5.33 g of the chloride salt of strontium? assume that all the heat produced is converted to emitted light. enter to 2 decimal places.

6.27 kJ

Explanation:

You need to do a conversion between nm to kJ/mol:

If you express the wavelength in meter resulting energy will be in joules so you continue with the conversion:

With 641 nm:

Now to calcule the energy released by 5.33 g of SrCl2 (M=158.53 g/mol) you take the previous calculated energy:

  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-

the dissolution of polymer can be thermodynamically described in 2 steps.