6.5 Out of C and CO, which is a better reducing agent at 673 K?

At 673 K, the value of $∆{G}_{\left(CO,C{O}_{2}\right)}$ is less than that of $∆{G}_{\left(C,C{O}_{2}\right)}$ . Therefore, CO can be reduced more easily to $C{O}_{2}$ than C to CO. Hence, CO is a better reducing agent than C at 673 K.