The enthalpies of the following reactions can be measured. CH, (g) + 202 (g)- CO

Question

The enthalpies of the following reactions can be measured. CH, (g) + 202 (g)- CO2 (g) + 2H20 (g) N/--802.4 kJ CH,OH (g)+3120,(3) Use these values and Hess's law to determine the enthalpy change for the reaction CH, (3)+ /20, (g) N1thkP =-676 kJ CO2 (g) + 2H20 (g) CH OH(g) 2. The enthalpies of the following reactions can be measured. CH, (g) +, 302 (g)- 2CO2 CHLOH (I) + 302 (g) Use these values and Hess's law to determine the enthalpy change for the reaction C,H, (g) + H20 (l) -- C,HOH (1) , (g) + 2H20 (1) =-1411.1 kJ Nr-l 367.5 kJ 2CO2 (g) + 3H20 (I)

Explanation / Answer

1)

Lets number the reaction as 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 3 = +1 * (reaction 1) -1 * (reaction 2)

So, deltaHo rxn for required reaction will be:

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

= +1 * (-802.4) -1 * (-676.0)

= -126.4 KJ/mol

Answer: -126.4 KJ/mol

Feel free to comment below if you have any doubts or if this answer do not work

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