| | Remaining Time: 18 minutes, 09 seconds. Question Completion Status: The stan

Question

| | Remaining Time: 18 minutes, 09 seconds. Question Completion Status: The standard enthalpies of formation for several substances are given below CO(g) H20(0) H2021) C2H50H0) -110.5 kJ/mol 285.8 kJ/mol 187.8J/mol 277.7 kJ/mol CO2(g) H20(g) CH30H(g) C2H50H(g) 393.5 kJ/mol -241.8 kJ/mol 200.7 kJ/mol 235.1 kJ/mol Determine theH' for the reaction below. 2C0(g) + 4H2(g) C2H5OH(g) + H2O(g) 0 a 255.9 kJ O b. -255.9 kJ OC. -366.4 kJ O d. 299.9 ku O e. -99.9 kJ Of -298.5 kJ 1 points Save Answer QUESTION 7 Which process is exothermic? 11:03 PM

Explanation / Answer

we have:

Hof(CO(g)) = -110.5 KJ/mol

Hof(H2(g)) = -0.0 KJ/mol

Hof(C2H5OH(g)) = -235.1 KJ/mol

Hof(H2O(g)) = -241.8 KJ/mol

Balanced chemical equation is:

2 CO(g) + 4 H2(g) ---> C2H5OH(g) + H2O(g)

Ho rxn = 1*Hof(C2H5OH(g)) + 1*Hof(H2O(g)) - 2*Hof( CO(g)) - 4*Hof(H2(g))

Ho rxn = 1*(-235.1) + 1*(-241.8) - 2*(-110.5) - 4*(-0.0)

Ho rxn = -255.9 KJ/mol

Answer: b

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