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April 25, 2015

Homework Help: Chemistry

Posted by Jessica on Monday, July 1, 2013 at 11:08pm.

Calculate the change in enthalpy when 52.0 g of solid chromium at 25C and 1 atm pressure is oxidized. (Hf for Cr2O3(s) is 1135 kJ/mol.)
4Cr(s) + 3O2(g)  2Cr2O3(s)

a. 1135 kJ
b. 284 kJ
c. 568 kJ
d. +1135 kJ
e. +568 kJ

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