Calculate the change in enthalpy
Calculate the change in enthalpy when 52.0g of Cr at 25 degrees celsius and 1 atm pressure is oxidized.
(delta Hf (degrees) for Cr2O3(s) is -1140kJ/mol)
4Cr(s) + 3O2(g) -> 2Cr2O3(s)
A. -1140kJ
B. +1140kJ
C. -570kJ
D. +570kJ
E. -285kJ
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