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14. Which substance(s) will have an enthalpy of formation equal to zero? a. Olg) b. O2...
Which of the following will NOT have a standard enthalpy of formation (ΔHfo) equal to zero? Select one: a. He(s) b. Ar(g) c. He(g) d. Al(s) e. N2(g)
Which of the following has a standard enthalpy of formation equal to zero? a) Chlorine gas Cl2 (g) b) Solid carbon dioxide CO2 (s) c) Gaseous carbon dioxide CO2 (g) d) none of the above
1. In which of the reactions below is H an enthalpy of formation? (a) S8(s) + 8O2(g) 8SO2(g) (b) CaO(s) + H2O(l) Ca(OH)2(s) (c) Cu(s) 1/2I2(s) CuI(s) (d) 1/2H2(g) + 1/2Cl2(g) + 2O2(g) HClO4(l) (e) both c and d are enthalpies of formation
Which thermochemical equation gives the value of the standard enthalpy of formation for NaN (s)? a(s) + 32 N2(g) → NaN3(s) a(s) +3N(g)-> NaNs(s) Na(s) + 3N2(g)->2NaN3(s) 3N Na(e) + 3/2 N2(g)-> NaN (s) No N3 H.(aq) + OH (aj → H2O) Which of the following reactions does not match the following net ionic equation: HCl(aq) +KOH(aq) CIO4(a)+ CsOH(aq HI(ag)+ NaOH(aq) shoa) OH (a)-,OR
the work for the problem/reasoning is zero for 14) For calculating the enthalpy of combustion of methane, AH CH4 (g) + O2(g) → 2H2O(g) + CO2(g) A) O2(g) B) CH4 (g) C) CO2 (g) D) H2O(g) E) Both O2 (g) and CH4 (g) 15) For which one of the following reaction equations is AH,xnequal to AH® for the product species? A) N2(g) + O2(g) → 2NO (g) B) 2H2(g) + O2(g) → 2H20 (1) C) 2H(g) + O2(g) → 2H20...
The standard heat of formation, ΔH∘f, is defined as the enthalpy change for the formation of one mole of substance from its constituent elements in their standard states. Thus, elements in their standard states have ΔH∘f=0. Heat of formation values can be used to calculate the enthalpy change of any reaction. Consider, for example, the reaction 2NO(g)+O2(g)⇌2NO2(g) with heat of formation values given by the following table: Substance ΔH∘f (kJ/mol) NO(g) 90.2 O2(g) 0 NO2(g) 33.2 Then the standard heat...
15. Determine the standard enthalpy of formation of Fe2O3(s), 2Fe(s) + 1.5 02 (g) → Fe2O3(s) given the thermochemical equations below. (4 points) AFH° = +160.9 kJ/mol-rxn Fe(s) + 3 H20(8) - Fe(OH)3(s) + 3/2 H (9) H2(g) + 1/2 O2(g) → H2O(6) Fe2O3(s) + 3 H2O(0) - 2 Fe(OH)3(8) A-H° = -285.8 kJ/mol-rxn A,Hº = +288.6 kJ/mol-rxn
19. What is the standard enthalpy of formation of liquid butyraldehyde, CH:CH2CH2CHOCO CHỊCH CHỊCHOI) + O2(g) – 4H2O) + 4CO(g); AH = -2471.8 kJ Substance AH/(kJ/mol) CO2(g) -393.5 H2O(1) -285.8 a. -245.4 kJ/mol b. +245.4 kJ/mol c. -1792.5 kJ/mol d. -3151.1 kJ/mol e. +3151.1 kJ/mol
Question 14 (1 point) Which of the following has a standard enthalpy of formation of zero? OP(s, red) Br2(g) O3(g) 12(8) Arce)
Question 13 4 pts Which of the following does not have a standard enthalpy of formation equal to zero at 25 °C and 1.0 atm? 0 Ti (s) O S8 (s) O H2 (g) o They all have standard enthalpy of zero O HCl (g)