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253 solutions

Entropy

Q. Chloroform, formerly used as an anaesthetic and now believed to be a carcinogen, has a heat of vaporization ΔHvaporization = 31.4 kJ mol-1. The change, CHCl3(l) CHCl3(g) has ΔSº = 94.2 J mol-1 K-1. At what temperature do we expect CHCl3 to boil (i.e., at what temperature will liquid and vapor be in equilibrium at 1 atm pressure)?

Solved • Dec 4, 2019

Entropy

Q. Calculate ΔSº for the following reactions in J K-1 from the data in the thermodynamic table below. On the basis of their values of ΔSº, which of these reactions are favored to occur spontaneously? NH3=192.5 N2=191.5 H2=130.6

Solved • Dec 4, 2019

Entropy

Q. What is the standard entropy change (ΔS°) for the following reaction given the standard molar entropy values?

Solved • Dec 3, 2019

Entropy

Q. Which of the following is always positive when a spontaneous process occurs? Group of answer choices Δ S surroundings Δ S universe Δ H universe Δ S s y s t e m

Solved • Dec 3, 2019

Entropy

Q. The normal boiling point of methanol is 64.7°C and the molar enthalpy of vaporization is 71.8 kJ/mol. What is the value of ΔS (in J/K) when 1.75 mol of methanol vaporizes at 64.7°C? Group of answer choices 372 1110 0.372 212 0.212

Solved • Dec 3, 2019

Entropy

Q. What is the standard entropy change (ΔS°) for the following reaction given the standard molar entropy values?

Solved • Dec 3, 2019

Entropy

Q. Which of the following reactions would have a positive value for ΔS?

Solved • Dec 3, 2019