Question

In: Chemistry

Find the average enthalpy of the SO bond in SO3(g) from the following standard molar enthalpies...

Find the average enthalpy of the SO bond in SO3(g) from the following standard molar enthalpies of formation (in kJ/mol): SO3(g) (–395.72), S(g) (278.81), O(g) (249.17).

a. 474.0 kJ/mol

b. 264.9 kJ/mol

c. 923.7 kJ/mol

d. 307.9 kJ/mol

e. 630.6 kJ/mol

Expert Solution

Correct answer is : (a.) 474.0 kJ/mol

Explanation

The reaction for the formation of SO₃ (g) is

S (g) + 3 O (g) SO₃ (g)

enthalpy change = H^o_f reactants - H^o_f products

enthalpy change = [H^o_f S (g) + 3 * H^o_f O (g)] - [H^o_f SO₃ (g)]

enthalpy change = [278.81 kJ/mol + 3 * (249.17 kJ/mol)] - (-395.72 kJ/mol)

enthalpy change = 278.81 kJ/mol + 747.51 kJ/mol + 395.72 kJ/mol

enthalpy change = 1422.04 kJ/mol

average enthalpy of SO bond = (enthalpy change) / 3

average enthalpy of SO bond = (1422.04 kJ/mol) / 3

average enthalpy of SO bond = 474.0 kJ/mol

queen_honey_blossom answered 2 years ago

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