Problem: Styrene is produced by catalytic dehydrogenation of ethylbenzene at high temperature in the presence of superheated steam.(a) Find ΔH°rxn, ΔG°rxn, and ΔS°rxn, given these data at 298 K:

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FREE Expert Solution

Reaction:

C6H5—CH2CH3 → C6H5—CH=CH2 + H2

(C7H10)                      (C7H8)





Step 1: We can use the following equation to solve for ΔH˚rxn:

ΔH˚f H2 = 0 kJ/mol


ΔH°rxn=ΔH°f, prod-ΔH°f, react


ΔH°rxn=(1 mol C7H8)103.8 kJ1 mol C7H8+0           -(1 mol C7H10)-12.5 kJ1 mol C7H10

ΔH°rxn = 116.3 kJ/mol



Step 2: We can use the following equation to solve for ΔG˚rxn:

ΔG˚f H2 = 0


ΔG°rxn=ΔG°f, prod-ΔG°f, react

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Problem Details

Styrene is produced by catalytic dehydrogenation of ethylbenzene at high temperature in the presence of superheated steam.

(a) Find ΔH°rxn, ΔG°rxn, and ΔS°rxn, given these data at 298 K:

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Based on our data, we think this problem is relevant for Professor Sadeghi's class at UTSA.

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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.