Răspuns:
1.
MSO3 =32+3×16=80g/mol
80gSO3.......48gO
100gSO3.......xg
x=100×48/80=calculează
MFeO=56+16=72g/mol
72gFeO..........16gO
100gFeO........ygO
y=100×16/72=calculează
MFe2O3 =2×56+3×16=160g/mol
160gFe2O3.............48gO
100gFe2O3............. zgO
z=100×48/160=calculează
2.
mpura=240×10/100=24gMg
MMgO =24+16=40g/mol
100gMg.............40gMgO
24gMg..............m
m=24×40/100=9,6gMgO