I am having difficulty with understanding this particular types of problems. 1)

ID: 579405 • Letter: I

Question

I am having difficulty with understanding this particular types of problems.

1) Calculate Hrxn for the following reaction:

C(s)+H2O(g)CO(g)+H2(g)

Use the following reactions and given H values:

C(s)+O2(g)CO2(g), H= -393.5 kJ

2CO(g)+O2(g)2CO2(g), H= -566.0 kJ

2H2(g)+O2(g)2H2O(g), H= -483.6 kJ

2) Calculate Hrxn for the following reaction:

5C(s)+6H2(g)C5H12(l)

Use the following reactions and given H values.

C5H12(l)+8O2(g)5CO2(g)+6H2O(g), H=3244.8 kJ
C(s)+O2(g)CO2(g), H=393.5 kJ
2H2(g)+O2(g)2H2O(g), H=483.5 kJ

Lets number the reaction as 0, 1, 2, 3 from top to bottom

required reaction should be written in terms of other reaction

This is Hess Law

required reaction can be written as:

reaction 0 = +1 * (reaction 1) -0.5 * (reaction 2) -0.5 * (reaction 3)

So, deltaHo rxn for required reaction will be:

deltaHo rxn = +1 * deltaHo rxn(reaction 1) -0.5 * deltaHo rxn(reaction 2) -0.5 * deltaHo rxn(reaction 3)

= +1 * (-393.5) -0.5 * (-566.0) -0.5 * (-483.6)

= 131.3 KJ

Answer: 131.3 KJ

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