ОХ41 Calculate the value of the following reactions 

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41. Calculate the value of the following reactions G 298 and set the direction in which they can occur spontaneously under standard conditions at 2980K:
NiO (k) + Pb (k) = Ni (k) + PbO (k);
Pb (k) + CuO (k) = PbO (k) + Cu (k);
8Al (k) +3 Fe3O4 (k) = 9 Fe (k) Al2O3 + 4 (k).