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calculeaza masele moleculare relative ale substantelor

H2,N2, O2,F2, CI2, Br2 ,I2 dau coronit urgent


Răspuns :

Mr(H2) =1*2=2
Mr (N2)=14*2=28
Mr(o2) =16*2=32
Mr( F2)=19*2=38
Mr(Cl2 ) =35*2=70
Mr(Br2)=80*2=160
Mr(I2)=127*2=254