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Calculeaza masa moleculara relativa pentru...dau coroana
Mr ( MgCl2)
Mr H2S04
Mr N2O5


Răspuns :

*Mr(MgCl2)=24+2×35,5=24+71=95
Mr(H2SO4)=2×1+32+4×16=98
Mr(N2O5)=2×14+5×16=108