FeCl_3 can be prepared from iron and chlorine in two ways: Which is true of the
ID: 1071083 • Letter: F
Question
FeCl_3 can be prepared from iron and chlorine in two ways: Which is true of the enthalpy changes of these routes? (A) The single-step route has an enthalpy change that can be larger or smaller than the two-step route, depending upon conditions. (B) The single-step route will have a smaller enthalpy change than the two-step route. (C) The single-step route will have a larger enthalpy change than the two-step route. (D) The overall enthalpy changes for the two routes art the same. Use these data to determine the enthalpy change for this reaction. Na_2 O_2 (g) rightarrow Na_2 O(l) + 1/2 O_2 (g) (A) +99 kJ (B) -99 kJ (C) + 198 kJ (D) cannot determine without Delta H_f degree for O_2 (g) Chlorine will oxidize 1 shown in this equation: Cl_2 + 2l^- rightarrow I_2 + 2Cl^- Use reactivity trends to predict which can be used to prepare Br_2 from Br^+. I F_2 + Br^+ II Cl_2 + Br^- III I_2 + Br^- (A) III only (B) I and II only (C) II and III only (D) I, II, and III A burled metal tank will not corrode if it is wired to a metal rod that corrodes more easily. Which combination protects the tank from corrosion? (A) Mg rod and Sn tank (B) Fe rod and Zn tank (C) Fe rod and Al tank (D) Cu rod and Zn tankExplanation / Answer
15) D
According to Hess's law
"The enthalpy of a given chemical reaction is constant irrespective of the fact that the reaction is taking place in one step or several steps"
So the overall enthalpy change for two routes is same
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