NEED EXPLANANTIONS Which of the following straight chain alkanes would you predi
ID: 521694 • Letter: N
Question
NEED EXPLANANTIONS
Which of the following straight chain alkanes would you predict is the most viscous? All are liquids exhibiting the general bonding pattern, CH_3-(CH_2)_n-CH_3. a. C_6H_14 b. C_12H_26 C. C_9H_20 d. C_5H_12 e. C_10H_22 A proposed mechanism for the reduction of nitrogen as NO by hydrogen is: Step 1: H_2(g) +2 NO(g) rightarrow N_2O(g) + (slow) H_2O(g) Step 2: N_2O(g) + H_2O(g) rightarrow N_2(g) + H_2O(g) (fast) Which of the following statements is NOT true? a. The reaction rate is probably second order in NO. b. The energy profile for this reaction probably has two maxima. c. The reaction rate is probably first order in H_2. d. N_2O is an intermediate. e. The activation energy for step 2 is probably less than that of step 1. Which of the following is/are true for a reversible process at equilibrium? I. Delta S_univ = 0 II. Delta S_sys = 0 III. Delta G_Sys = 0 a. I only b. II only c. III only d. I and III only e. I, II, and III are all true.Explanation / Answer
a.
The more the atoms present in the chain,the more the atoms interact with themselves,increasing the amount of vander waals forces .Longer the chain,the more molecules get entangled and wrap around around themselves.Both of these instances increases the viscosity.
b.N2O is an unstable intermediate.
G Is always zero for a reversible process if it is carried out at constant temperature and pressure and the only kind of work involved is the pV work.
If the only kind of work involved is pV in the above conditions, it is true that the maximum work obtained is zero.
For a reversible process, the entropy of some other system must change by an equal and opposite amount, in order to keep the total constant. That is, S+Ssurroundings=0
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