Answer to Question #167738 in General Chemistry for Brenda Palomo

Question

Use the data from this table of thermodynamic properties to calculate the values of Δ𝑆 rxnΔSrxn∘ for each of the reactions at 25 °C.

25 °C.

4NH3(g)+7O2(g)⟶4NO2(g)+6H2O(g)

Answer 1

∆S_rxn=∆S_products-∆S_reactants

∆S_rxn=(∆S(NO₂))⁴+(∆S(H₂O))⁶-(∆S(NH₃))⁴-(∆S(O₂))⁷

From the tables data in the internet:

∆S_rxn=(240.06)⁴+(188.83)⁶-(192.5)⁴-(205.14)⁷=3.32•10⁹+6.73•10⁶-1.37•10⁹-1.53•10¹⁶~(-1.53•10¹⁶) (J/mol•K)