Răspunsuri

2014-11-13T22:55:32+02:00
  2,45g         x g
2KClO3 = 2KCl +3O2
 245            179
g/mol          g/mol
m(KCl)=(2,45*179):245=1,79g.
2014-11-13T23:20:17+02:00
KClO3->KCL + 3/2 O2
masa KClO3=2,45g 
masa molara KClO3=39+35+48=122g/mol
nr de moli KClO3=2,45/122=0.02 moli 
Din reactie => 0.02 moli KCl
nr de moli =m/masa molara
masa molara KCl=39+35=74 g/mol
=>0.02=m/74=>m=74*0.02=1.48 g KCl
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