Be sure to answer all parts. Calculate the standard free-energy changes for the following reactions at 25°C: (a) H2(g) + Br2(l)→2HBr(g)                                  kJ/mol (b) 2C2H6(g) + 7O2(g)→4CO2(g) + 6H2O(l)                                  kJ/mol

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Asked Nov 20, 2019
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Be sure to answer all parts.
 
Calculate the standard free-energy changes for the following reactions at 25°C:
 

(a) H2(g) + Br2(l)
2HBr(g)

                                  kJ/mol
 

(b) 2C2H6(g) + 7O2(g)
4CO2(g) + 6H2O(l)

                                  kJ/mol

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Expert Answer

Step 1

The standard free-energy change of any reaction is calculated by the formula shown below.

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AG=mAG (products)-En-AG (products) Where m and nis the mole of reactant.

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Step 2

Part (a)

 

The given reaction is show below.

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H, (8)+Br, (8)HBr(g)

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Step 3

The standard Gibbs free energy formation of HBr (g) is -53.51 kJ/mol.

The standard Gibbs free energy formation of H2 (g) is 0 kJ/mol.

The standard Gibbs free energy form...

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[2-AGE (HBr (8)-1-AG; (H, (g)) +1 - AG; (F (g)] AG

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