1) which of the following species has the greatest entropy (S 0 ) at 25 0 C? exp
ID: 806770 • Letter: 1
Question
1) which of the following species has the greatest entropy (S0) at 250C? explain why you chose the answer.
a) SiO2 (s) b) N2O4 (g) c) NO2 (g) d) CH3OH (l) e) He (g)
What is the overall order of the reaction? Explain why you chose the answer
a) first order b) second order c) third order d) not enough information
3) The rate law for the following reaction is; Rate=k[A]2. which of the following would not change the reaction rate? EXPLAIN why you chose the answer
a) the concentration of A is increased
b) the temperature is decreased
c) the rate is measured again after the reaction has run for a while
d) An appropriate catalyst is added to the reaction
e) all of these (a)-(d) would change the reaction rate
Explanation / Answer
1) e) He (g) has the highest entropy because it is a noble gas and is unreactive.
2) d) not enough information
Order of a reaction is an expermintally determined value
3) e) all of these (a)-(d) would change the reaction rate
Because the rate of reactions depends upon the concentration of reactants, catalyst and temeprature
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