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Thermo practice

Quiz by Natalie Wieland

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Q 1/13
Score 0
The standard enthalpy of formation for nitrogen dioxide is the enthalpy change of the reaction
29

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)

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13 questions

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Q1
The standard enthalpy of formation for nitrogen dioxide is the enthalpy change of the reaction
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)
60s
Q2
Which of the following has a non-zero standard enthalpy of formation?
H2O(l)
Hg(l)
N2(g)
Na(s)
60s
Q3
For endothermic reactions at constant pressure
dH>0
dH<0
dS>0
S<0
60s
Q4
At a certain temperature C(s) + O2(g) --> CO2(g) has a dG of -339.4 kJ/mol. This means that at this temperature
the system is at equilibrium
the system will not react
this system has a high reaction rate
gaseous carbon dioxide spontaneously forms
60s
Q5
Which processes are spontaneous at all temperatures?
dH (+) and dS (-)
dH (+) and dH (+)
dH (-) and dS (-)
dH (-) and dS (+)
60s