Question 1

Calculate the enthalpy change for the reaction NO(g)  + O(g)   NO2(g) 
From the following data:
NO(g)  + O3(g)   NO2(g)  + O2(g)  H = -198.9 kJ
O3(g)   1.5O2(g)  H = -142.3 kJ
O2(g)   2O(g)  H = 495.0 kJ

Accepted Answer

A)   -551.6 kJ
B)   -304.1 kJ
C)   190.9 kJ
D)   153.8 kJ
E)   438.4 kJF) B) and E)
G) C) and E)

Question 2

Given the following data:  calculate F1F1F1S1F1F1F10H° for the reaction
NO(g) + O(g) F1F1F1S1F1F1F10 NO2(g)

Accepted Answer

<font face="symbol">F...

Question 3

Although internal energy (E) is more fundamental and conceptually easier than enthalpy (H), in most chemical applications F1F1F1S1F1F1F10H is more relevant and useful than F1F1F1S1F1F1F10E. Why?

Accepted Answer

Most chemical processes of interest occu...

Question 4

If, as a pioneer, you wished to warm your room by taking an object heated on top of a pot-bellied stove to it, which of the following 15-pound objects, each heated to 100°C, would be the best choice? The specific heat capacity (in J/(g·K) )  for each substance is given in parentheses. Iron (0.450) , copper (0.387) , granite (0.79) , gold (0.129) , water (4.18) .

Accepted Answer

A)   iron
B)   copper
C)   granite
D)   gold
E)   waterF) B) and E)
G) All of the above

Question 5

A system delivers 1275 J of heat while the surroundings perform 855 J of work on it. Calculate E in J.

Accepted Answer

A)   -2130 J
B)   -420 J
C)   420 J
D)   2130 J
E)   -1275 JF) B) and E)
G) A) and C)

Exam 6: Thermochemistry: Energy Flow and Chemical Change

A system delivers 1275 J of heat while the surroundings perform 855 J of work on it. Calculate E in J.

Correct Answer
verified

Although internal energy (E) is more fundamental and conceptually easier than enthalpy (H), in most chemical applications H is more relevant and useful than E. Why?

Correct Answer
verified
Most chemical processes of interest occu...
View Answer

Given the following data: calculate H° for the reaction NO(g) + O(g)  NO₂(g)

Correct Answer
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F...
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Calculate the enthalpy change for the reaction NO(g) + O(g)  NO₂(g) From the following data: NO(g) + O₃(g)  NO₂(g) + O₂(g) H = -198.9 kJ O₃(g)  1.5O₂(g) H = -142.3 kJ O₂(g)  2O(g) H = 495.0 kJ

Correct Answer
verified

Correct Answer
verified

Exam 6: Thermochemistry: Energy Flow and Chemical Change

A system delivers 1275 J of heat while the surroundings perform 855 J of work on it. Calculate E in J.

Correct AnswerverifiedShow Answer

Although internal energy (E) is more fundamental and conceptually easier than enthalpy (H), in most chemical applications H is more relevant and useful than E. Why?

Correct AnswerverifiedMost chemical processes of interest occu...View AnswerShow Answer

Given the following data: calculate H° for the reaction NO(g) + O(g)  NO2(g)

Correct AnswerverifiedF...View AnswerShow Answer

Calculate the enthalpy change for the reaction NO(g) + O(g)  NO2(g) From the following data: NO(g) + O3(g)  NO2(g) + O2(g) H = -198.9 kJ O3(g)  1.5O2(g) H = -142.3 kJ O2(g)  2O(g) H = 495.0 kJ

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
Most chemical processes of interest occu...
View Answer

Given the following data: calculate H° for the reaction NO(g) + O(g)  NO₂(g)

Correct Answer
verified
F...
View Answer

Calculate the enthalpy change for the reaction NO(g) + O(g)  NO₂(g) From the following data: NO(g) + O₃(g)  NO₂(g) + O₂(g) H = -198.9 kJ O₃(g)  1.5O₂(g) H = -142.3 kJ O₂(g)  2O(g) H = 495.0 kJ

Correct Answer
verified

Correct Answer
verified