Consider the intermediate equations: 3 equations.

C(s) + O2(g) --> CO2(g) Delta H1 = -393.5 kJ

2CO(g) + O2(g) --> 2CO2(g) Delta H2 = -566.0 kJ

2H2O(g) --> 2H2(g) + O2(g) Delta H3 = 483.6 kJ

With the overall reaction:

C(s) + H2O(g) --> CO(g) + H2(g) Delta Hrxn = ?

QUESTION 1:

What must be done to calculate the enthalpy of reaction?

The first must be halved.

The first must be reversed.

The second must be halved.

The second must be reversed.

The third must be halved.

The third must be reversed.

QUESTION 2:

What is the overall enthalpy of reaction?

Delta Hrxn = ____ kJ