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.


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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