Question 6 Above what temperature does the following reaction become nonspontane
ID: 830999 • Letter: Q
Question
Question 6
Above what temperature does the following reaction become nonspontaneous?
FeO(s) + CO(g) ? CO2(g) + Fe(s) ?H = -11.0 kJ; ?S = -17.4 J/K
298 K
632 K
191 K
This reaction is nonspontaneous at all temperatures.
This reaction is spontaneous at all temperatures.
2 points
Question 7
Consider the following reaction at constant P. Use the information here to determine the value of ?Ssurr at 355 K. Predict whether or not this reaction will be spontaneous at this temperature.
2 NO(g) + O2(g) ? 2 NO2(g) ?H = -114 kJ
?Ssurr = +114 kJ/K, reaction is spontaneous
?Ssurr = -321 J/K, reaction is not spontaneous
?Ssurr = +321 J/K, reaction is spontaneous
?Ssurr = +114 kJ/K, reaction is not spontaneous
?Ssurr = +321 J/K, it is not possible to predict the spontaneity of this reaction without more information.
2 points
Question 8
According to the third law of thermodynamics,
the entropy of the universe increases for any spontaneous process.
the entropy of a perfectly ordered, crystalline substance is zero at 0 Kelvin.
the entropy increases for any spontaneous process.
energy is conserved in any transformation of matter.
2 points
Question 9
Which of the following processes have a ?S > 0?
CH3OH(l) ? CH3OH(s)
CH4(g) + H2O (g) ? CO(g) + 3 H2(g)
N2(g) + 3 H2(g) ? 2 NH3(g)
Na2CO3(s) + H2O(g) + CO2(g) ? 2 NaHCO3(s)
All of the above processes have a ?S > 0.
2 points
Question 10
Determine ?G
298 K
632 K
191 K
This reaction is nonspontaneous at all temperatures.
This reaction is spontaneous at all temperatures.
Explanation / Answer
Above what temperature does the following reaction become nonspontaneous?
FeO(s) + CO(g) ? CO2(g) + Fe(s) ?H = -11.0 kJ; ?S = -17.4 J/K
298 K
632 K
191 K
This reaction is nonspontaneous at all temperatures.
This reaction is spontaneous at all temperatures.
2 points
Question 7
Consider the following reaction at constant P. Use the information here to determine the value of ?Ssurr at 355 K. Predict whether or not this reaction will be spontaneous at this temperature.
2 NO(g) + O2(g) ? 2 NO2(g) ?H = -114 kJ
?Ssurr = +114 kJ/K, reaction is spontaneous
?Ssurr = -321 J/K, reaction is not spontaneous
?Ssurr = +321 J/K, reaction is spontaneous
?Ssurr = +114 kJ/K, reaction is not spontaneous
?Ssurr = +321 J/K, it is not possible to predict the spontaneity of this reaction without more information.
2 points
Question 8
According to the third law of thermodynamics,
the entropy of the universe increases for any spontaneous process.
the entropy of a perfectly ordered, crystalline substance is zero at 0 Kelvin.
the entropy increases for any spontaneous process.
energy is conserved in any transformation of matter.
2 points
Question 9
Which of the following processes have a ?S > 0?
CH3OH(l) ? CH3OH(s)
CH4(g) + H2O (g) ? CO(g) + 3 H2(g)
N2(g) + 3 H2(g) ? 2 NH3(g)
Na2CO3(s) + H2O(g) + CO2(g) ? 2 NaHCO3(s)
All of the above processes have a ?S > 0.
2 points
Question 10
Determine ?G
298 K
632 K
191 K
This reaction is nonspontaneous at all temperatures.
This reaction is spontaneous at all temperatures.
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