ΔH=ΔHr1-ΔH r2= -1667,82kj+819,28kg=> - 848,54kj
aceasta caldura se dagaja la formarea unui mol de oxide aluminiu carea are masa molara M= (2x27gAl+3x16gO)/mol=102g/mol
(-848,54kj).........................102gAl2O3
1000g.......................................X-------------------------CALCULEAZA !!!!
