February 27, 2017

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 25°C and 1 atm pressure is oxidized. (H°f 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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