2 C(s) + O2(g) → 2 CO(g)... ∆H = -222 kJC(s) + O2(g) → CO2(g)...∆H = -394 kJ2 H2(g) + O2(g) → 2H2O(g)...∆H = -484 kJ


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Using Hess" Law, usage the given chemical equations to add up come the wanted final reaction.

You are watching: Co g h2o g co2 g h2 g

Flipping one equation method ∆H transforms signMultiplying an equation through X way ∆H is also multiplied by X

Equation 1: flip and divide by 2

2 C(s) + O2(g) → 2 CO(g)... ∆H = -222 kJ

becomes... CO(g) --> C(s) + 1/2 O2(g) ... ∆H = 111 kJ

Equation 2: save the same

C(s) + O2(g) → CO2(g)... ∆H = -394 kJ

Equation 3: division by 2

2 H2(g) + O2(g) → 2H2O(g) ... ∆H = -484 kJ

becomes... H2(g) + 1/2 O2(g) → H2O(g) ... ∆H = -242 kJ

Add increase the modified chemistry equations to same the desired equation. Cancel the end reactants with same coefficients if they appear on both sides of the arrow.

CO(g) → C(s) + 1/2 O2(g) ... ∆H = 111 kJ

C(s) + O2(g) → CO2(g)... ∆H = -394 kJ

+ H2(g) + 1/2 O2(g) → H2O(g) ... ∆H = -242 kJ

––––––––––––––––––––––––––––––––––––––––––––––––––––

CO (g) + H2 (g) + O2 (g) CO2 (g) + H2O (g) ... ∆H = -525 kJ


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