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5 moli H2So4; 2 mole Fe2O3
5 moli H2SO4 --- x moli Fe2O3
3 mole H2SO4 --- 1 mol Fe2O3
x=5*1/3= 1,66 mola - użyto 2 mole Fe2O3, a przereagowało 1,66. Fe2O3 jest więc w nadmiarze.
M Fe2(SO4)3 = 2*56g/mol + 3*32g/mol + 12*16g/mol = 400 g/mol
5 moli H2SO4 --- x moli Fe2(SO4)3
3 mole H2SO4 --- 1 mol Fe2(SO4)3
x=5*1/3= 1,66 mola Fe2(SO4)3
m Fe2(SO4)3 = M*x= 400g/mol*1,66 mola= 664 g Fe2(SO4)3