Practice Types Of Enthalpy Changes With Illustrative Examples (1.4)

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6 sample questions

Question 1.
What is the enthalpy of formation of water in kJ?
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Look for standard values from your resources.
Question 2.
Define enthalpy of combustion.
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Consider how combustion differs from other reactions.
3Question 3.
What does a negative ΔH_f° indicate?
- Heat is absorbed
- Heat is released
- No heat change
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Think about the energy flow during formation.
4Question 4.
Is the enthalpy of combustion always negative?
- True
- False
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Recall the nature of energy in combustion.
Question 5.
A compound has a ΔH_f° of -50 kJ/mol. If 4 moles of this compound are formed, what is the total heat change?
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Multiply the ΔH_f° value by the number of moles.
Question 6.
Given the reaction C3H8 + 5 O2 → 3 CO2 + 4 H2O; if ΔH_f° for propane is -104.7 kJ/mol, calculate ΔH_rxn° when 1 mole of propane combusts.
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Focus on determining products' total ΔH_f° and subtracting reactants' values.

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