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:

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

$ΔH °_{rxn} = ΔH °_{f, prod} - ΔH °_{f, react}$

$ΔH °_{rxn} = [(1 mol C_{7} H_{8}) (\frac{103.8 kJ}{1 mol C_{7} H_{8}}) + 0] - [(1 mol C_{7} H_{10}) (\frac{- 12.5 kJ}{1 mol C_{7} H_{10}})]$

ΔH°_rxn = 116.3 kJ/mol

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

ΔG˚_f H₂ = 0

$ΔG °_{rxn} = ΔG °_{f, prod} - ΔG °_{f, react}$

98% (50 ratings)

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:

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Gibbs Free Energy concept. You can view video lessons to learn Gibbs Free Energy. Or if you need more Gibbs Free Energy practice, you can also practice Gibbs Free Energy practice problems.

What professor is this problem relevant for?

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

What textbook is this problem found in?

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.