Which molecule do you expect to have the lowest molar entropy at 300 K? Circle t

Question

Which molecule do you expect to have the lowest molar entropy at 300 K? Circle the correct answer and briefly explain your answer. CHF_3(g) CHCI_3(g) CHBr_3(g) CHI_3(g) 2. Consider the change shown below and write a general differential expression for the change in energy, enthalpy, and entropy in terms of measureable quantities (things that can be looked up or measured easily in lab. i.e. C_P, C_V, alpha, K_T, P, V, T). (n, V_1, P, T_1) rightarrow (n,V_2,P,T_2) a) dE = b) dH = c) dS = 3. Consider a process that takes 1 mole of an ideal gas initially at 300 K and 1.00 bar to a final state where the pressure has increased to 10.0 bar. Do the calculations and answer the questions below about this change in state. a) Calculate DeltaE, DeltaH, DeltaS, DeltaF, and DeltaG for a one-step, reversible, isothermal path from the initial state to the final state. b) Imagine a two step path in which the first step is an adiabatic compression to the final pressure. Without doing any calculations, is T_2 larger than, equal to, or smaller than 300 K? Briefly explain how you know. (The two-steps are shown below.) IG(1 mole, 300 K, 1.00 bar) -(q=0)righarrow IG(1 mole, T_2,10.0 bar)rightarrow IG(1 mole, 300 K, 10.0 bar) c) What are the values of DeltaE, DeltaH, DeltaS, DeltaF, and AG for the overall two-step process depicted in part b)?

Explanation / Answer

1. I expect CHF3 to have the lowest molar entropy because it has the stronger organic bond (C-F), When the molecules are in the same state and they have the same amount of atoms then the molar entropy depends on the strength of the bonds, stronger bonds means lowers molar entropies.

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