a.
2Na + Cl2 => 2NaCl
b.
0 0 +1 -1
2Na + Cl2 => 2NaCl
Na(0)_-1e-_>Na(+1), oxid (ag. red)
Cl(0)_+1e-_>Cl(-1) reducere (ag ox)
c.
ms1 = 600 g , c1% = 20%
stim ca c% = mdx100/ms
=> md = ms1xc1%/100
= 600x20/100 = 120 g NaCl
ms2 = ms1 + m.apa
c2% = mdx100/ms2
= 120x100/800 = 15%