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DAU COROANA!!!
calculeaza masa moleculara relativa:N2O,NH3,P2O5,FE2O3,CACO3


Răspuns :

N2O=14*2+16=28+16=44
NH3=14+3=17
P2O5=31*2+16*5=62+80=142
FE2O3=56*2+16*3=112+48=160
CACO3=40+12+16*3=40+12+48=52+48=100