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Q 1/13
Score 0
The standard enthalpy of formation for nitrogen dioxide is the enthalpy change of the reaction
60
1/2N2(g) + O2(g) --> NO2(g)
N2(g) + 2O2(g) --> N2O4(g)
NO(g) + 1/2O2(g) --> NO2(g)
N2(g) +2O2(g) --> 2NO2(g)
Q 2/13
Score 0
Which of the following has a non-zero standard enthalpy of formation?
60
H2O(l)
Hg(l)
N2(g)
Na(s)
13 questions
Q.
The standard enthalpy of formation for nitrogen dioxide is the enthalpy change of the reaction
1
60 sec
Q.
Which of the following has a non-zero standard enthalpy of formation?
2
60 sec
Q.
For endothermic reactions at constant pressure
3
60 sec
Q.
At a certain temperature C(s) + O2(g) --> CO2(g) has a dG of -339.4 kJ/mol. This means that at this temperature
4
60 sec
Q.
Which processes are spontaneous at all temperatures?
5
60 sec
Q.
The process which is nonspontaneous at all values of temperature is
6
60 sec
Q.
Which of these four processes is improbable at a low temperature but becomes more probable as the temperature rises?
7
60 sec
Q.
In which of the following four processes is there an increase in entropy?
8
60 sec
Q.
What is the enthalpy change for the following reaction under standard conditions? CS2(l) + 3O2(g) --> CO2(g) + 2SO2(g), dHf CS2(l) = +88 kJ/mol, dHf CO2(g) = -394 kJ/mol, dHf SO2(g) = -297 kJ/mol
9
120 sec
Q.
A reaction takes place within a system. As a result, the entropy of the system decreases. Which of the following statements MUST be true?
10
60 sec
Q.
When propane burns in air, heat is released: C3H8(g) + 5O2(g) --> 3CO2(g) + 4H2O (g). What are the signs of H, S, and G (respectively) for this process as illustrated by the above equation
11
60 sec
Q.
Electrolysis of water is a chemical change because
12
60 sec
Q.
Gas A2 reacts with gas B2 to form gas AB at constant temperature. The bond energy of AB is much greater than that of either reactant. For this process, what are the signs of dH and Ssurr?
