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Lucaandreeaiust
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DEMONSTRATI LEGEA CONSERVARII MASEI SUBSTANTELOR IN REACTIILOR DE mai JOS:a)Hcl+NaOH-›Nacl+H2O
b)CaO+H2O -›Ca(OH)2

Răspuns :

Mihaiimbrisca
a)HCl+NaOH⇒NaCl+H2O
MHCl=AH+ACl=1+35,5=36,5g
MNaOH=ANa+AO+AH=40+16+1=40g
MNaCl=ANa+ACl=40+35,5=58,5g
MH2O=2×AH+AO=2×1+16+18g
36,5+40=58,5+18 ;
b) CaO+H2O⇒Ca(OH)2
MCaO=ACa+AO=40+16=56g
MH2O=2×AH+AO=2×1+16+18g
MCa(OH)2=ACa+2×AO+2×AH=40+2×16+2×1=74g
 56+18=74

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