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Nechitamagdale
a fost răspuns

Calculati :
Masa moleculara a : KMnO4 , H3PO4, K2Cr2O7


Răspuns :

M KMnO4=39+55+4*16=158
M H3po4=3+64+31=98
M k2cr207=2*39+52*2+16*7=78+104+112=294