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Chemistry B-Thermochemical Equations-Assignment/Quiz
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Chemistry B-ThermochemicalEquations-Assignment/Quiz
Which of these statements are true? Select all that apply - -A,C,F
- What is the enthalpy of reaction for the decomposition of calcium
carbonate?
CaCO3(s) es001-1.jpg CaO(s) + CO2(g) - -656.3
- This Reaction is - -endothermic
- How much energy is released when 0.40 mol C6H6(g) completely reacts
with oxygen?
2C6H6(g) + 15O2(g) es001-1.jpg 12CO2(g) + 6H2O(g) - --1286
- What is the enthalpy of reaction for the decomposition of NO2(g)?
2NO2(g) es002-1.jpg N2(g) + 2O2(g) - --67.68
- This reaction is - -exothermic
- The enthalpy of combustion for octane (C8H18(l)), a key component of
gasoline, is -5,074 kJ/mol. This value is the mc001-1.jpgHrxn for which of the
following reactions? - -C8H18(l) + 12.5O2(g) mc001-3.jpg 8CO2(g) +
9H2O(g)
Letter:b
- What is the es002-1.jpgHf for this reaction?
16CO2(g) + 18H2O(g) es002-2.jpg 2C8H18(l) + 25O2(g) - -10.148
- Why do you think knowing enthalpy of reaction might be useful? - -It
allows Scientist to predict the temperature change during a reaction.
- Which graph represents an exothermic reaction? - -mc004-1.jpg
Letter:A
- Consider the combustion reaction,
mc018-1.jpg
, where C2 H2 (mc018-2.jpgHf = 227.4 kJ/mol), CO2 (mc018-3.jpgHf = -393.5
kJ/mol), and H2 O (mc018-4.jpgHf = -241.82 kJ/mol). What is the enthalpy of
the reaction? - -Not B
- Which statement is true for most chemical reactions? - -An energy change
occurs during the breaking and forming of bonds.
- How is enthalpy used to predict whether a reaction is endothermic or
exothermic? - -not a
- This table lists some compounds, their enthalpies of formation, and their
combustion reactions.
Compound
DH°f (kJ/mol)
Combustion Reaction
Carbon dioxide (CO2 )
-393.5
Water (H2 O)
-241.82
Ethanol (C2 H6 O)
-235.1
C2 H6 O + O2 mc017-1.jpg 2CO2 + 3H2 O
Propane (C3 H8 )
-103.8
C3 H8 + O2 mc017-2.jpg 3CO2 + 4H2 O
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