- caalculez masa deMnO2 si Mn2O3 din amestec
m,MnO2= 80/100x500g= 400g
m,Mn2O3= 20/100x500g= 100g
M,MnO2= (55gMn+2x16gO)/mol=87g/mol
M,Mn2O3= (2x55gMn+3x16gO)/mol=158g/mol
in 87gMnO2.......sunt 55gMn
400g...........................x=
in 158g Mn2O3 ...sunt....110gMn
100g...............................y
calculeaza x, y ,apoi x+y !!!!