Question

calculate the standard enthalpy of formation of CO2 from the following data:

1. C(s,graphite) + 1/2 O2(g) = CO(g) ∆H°25°c=-110.5 kJ
2. CO2(g)+C(s,graphite)= 2 CO(g) ∆H°25°c=172.5 kJ

Answer 1

Standard enthalpy of formation=$-825$