Question: Consider the following data. 2 CaO(s) 2 Ca(s) + O 2 (g) H = +1270.2 kJ C(s) + O 2 (g) CO 2 (g) H

Consider the following data.

2 CaO(s) 2 Ca(s) + O2(g) H = +1270.2 kJ
C(s) + O2(g) CO2(g) H = -393.5 kJ
CaCO3(s) CaO(s) + CO2(g) H = +178.3 kJ

Use Hess's law to calculate H for the reaction below.

2 CaCO3(s) 2 C(s) + 2 Ca(s) + 3 O2(g)

H = kJ

(THE ANSWER IS NOT -311.0)

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