Problem: For the reaction 2CH4(g)→C2H6(g)+2H2(g) calculate ΔG∘rxn at 25 °C.Express your answer using one decimal place.Standard Thermodynamic Quantities for Selected Substances at 25 °C   Substance      ΔH∘f(kJ/mol)      S∘(J/mol⋅K)      CH4(g)   −74.6   186.3   C2H6(g)   −84.68   229.2   H2(g)   0   130.7   N2(g)   0   191.6   NH3(g)   −45.9   192.8   N2H4(g)   95.4   238.5   NO(g)   91.3   210.8   O2(g)   0   205.2   KCl(s)   −436.5   82.6   KClO3(s)   −397.7   143.1

FREE Expert Solution

ΔG°rxn=ΔH°rxn-TΔS°rxn


For this problem, we need to do the following steps:

Step 1: Calculate ΔH˚rxn.

Step 2: Calculate ΔS˚rxn.

Step 3: Use ΔH˚rxn and ΔS˚rxn to calculate for ΔG˚rxn.


92% (429 ratings)
View Complete Written Solution
Problem Details

For the reaction 2CH4(g)→C2H6(g)+2H2(g) calculate ΔG∘rxn at 25 °C.

Express your answer using one decimal place.

Standard Thermodynamic Quantities for Selected Substances at 25 °C

   Substance   
   ΔH∘f(kJ/mol)   
   S∘(J/mol⋅K)   
   CH4(g)
   −74.6
   186.3
   C2H6(g)
   −84.68
   229.2
   H2(g)
   0
   130.7
   N2(g)
   0
   191.6
   NH3(g)
   −45.9
   192.8
   N2H4(g)
   95.4
   238.5
   NO(g)
   91.3
   210.8
   O2(g)
   0
   205.2
   KCl(s)
   −436.5
   82.6
   KClO3(s)
   −397.7
   143.1

Frequently Asked Questions

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 Langowski's class at RUTGERS.