i course: CHEM × / D Enthalpy EC c1 Mail-ehuang 1 e it 13.2 Kg C3He D Student Ce

Question

i course: CHEM × / D Enthalpy EC c1 Mail-ehuang 1 e it 13.2 Kg C3He D Student Center x Gator Scheduler × Upper Division X x × O file:///C:/Users/En%20Fa/Downloads/Enthalpy%20EC%20c1 15.pdf Reload this page C 2. Find dHon for C (s) + H2O (g) CO (g) + H2 (g) AHn -393.5 kJ given: C + O2 CO2 2CO + O2 2CO2 2H2 + O2 2H2O dHrxn =-566.0 kJ Hrxn =-483.6 kJ 3. Use Hess's law to solve the following: Given dHon values for equations 1 and 2, what is Hn for equation 3? S (s) + O2 (g) SO2 (g) 2502 (g) + O2 (g) 2S03 (g) S (s) + 1.5 O2 (g) SO3 (g) AHpn -296.8 kJ dHxn--1 98.4 kJ O Type here to search ^ ENG 10:54AM 11/27/2017

Explanation / Answer

2)

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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