Question 13 4 pts Which of the following does not have a standard enthalpy of formation...
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)
Question 4 2 pts All of the following have enthalpy of formation values of zero except Ne(g) Fe(s) N2(8) Br2(1) N(g) Question 5 3 pts U, H, q, w, VT,P Consider the following list of in thermodynamic quantities: How many variables listed above are state functions? 4 2 07
Question 17 1 pts 17. According to the definition of standard enthalpy of formation, AH, which of the following's AH is zero? O OH(aq) Hg(s) Al(s) NaCl(s) Hez(g) 1 pts D Question 18 18. Given the data in the table below, calculate the AHørxn (kJ) for the reaction 4NH3(g) + 5O2 (g) - 4NO (g) + 6H20 (1)
Question 6 1 pts Which of the following reactions is a standard formation reaction (i.e. АHræn = AH) at T = 298 K? O 2 Fe (s) + 1.5 O2() → Fe2O3(s) O N2(1) + 2 O2(1) ► N204(1) O CO(g) + 2H2(g) + CH3OH(1) O C(s, graphite) + H2(g) + O2(g) → C6H1206(s) O Cl2(g) + H2(g) →2 HCl(g) Question 4 1 pts A sample of 1.71 moles of a substance was burned in a constant pressure calorimeter. The...
4. [201 At 500 K, we have the data of standard enthalpy of formation and standard entropy of formation as follows: AH° (kJ/mol) AfSe (J/K mol) Substance HI (g 32.41 221.63 Н2 (g) 5.88 145.64 I2 (g) 69.75 279.94 One mole of H2 and one mole of I2 are placed in a vessel at 500 K. At this temperature only gases are present and the equilibrium of the following reaction is established. Н2 (9) + I, (9) 2HI (g) (1)...
Question 16 (1 point) The standard enthalpy of formation of NiSO4(s) at 25 °C is -872.9 kJ/mole. The chemical equation to which this value applies is NISO4(s) - Ni(s) + S(s) + 4 O(g) Ni(s) + S(s) + 4 O(g) – NiSO4(s) Ni(s) + 1/8 S8(s) + 1/2O2(g) - NISO4(s) Ni(s) + S(s) + 2 O2(g) – NISO4(s) 1/2 Ni(s) + 1/2 S(s) + 1/2O2(g) - 1/2 NISO4(s) o * 5 =
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 17 (1 point) What is the reaction for the standard enthalpy of formation for HCl(g)? 1/2 H2(1) + 1/2012(8) - HCI(1) H(aq) + Cl(aq) - HCl(g) 1/2 H2(g) + 1/2012(1) - HCl(s) NH3(g) + Cl2(8) -- NH2Cl(g) + HCl(g) 1/2 H2(g) + 1/2Cl2(8) -- HCl(g) Question 18 (1 point) A piece of iron (mass = 25.0 g) at 398 K is placed in a ste
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
Which of the following substances has/have a non-zero value for enthalpy of formation at 25 °C and 1.00 atm pressure? 1. O (g) (gaseous atomic oxygen) 2. O2 (g) (oxygen gas molecule) 3. O3 (g) (Ozone gas) o 1 only O 2 only o 3 only 1 and 3 only 1.2. and 3