alleryC + O2 → CO2 has ∆rH -393.5 and CO + ½O2 → CO2 has -283.0 kJ/mol. ∆rH for C + ½O2 → CO?
A+110.5 kJ/mol
B-110.5 kJ/mol
C-676.5 kJ/mol
D-283.0 kJ/mol
Answer & Solution
Correct answer: B. -110.5 kJ/mol
Adding the first equation to the reverse of the second gives -393.5 + 283.0 = -110.5 kJ/mol.
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