2.2.1 - Statement of Hess’s Law
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Practice Questions
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What does Hess's Law state?
💡 Hint: Think about the enthalpy being a state function.
What is a state function?
💡 Hint: Does it depend on how you got there?
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Interactive Quizzes
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What does Hess's Law indicate about total enthalpy change?
💡 Hint: Consider if the steps matter.
True or False: Hess's Law can be utilized to calculate the enthalpy changes from known reactions.
💡 Hint: Think about combining reactions.
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Challenge Problems
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Calculate the ΔH for the reaction: 2 H₂(g) + O₂(g) → 2 H₂O(l) using Hess's Law if you know the standard enthalpy of formation for H₂O is -285.8 kJ/mol.
💡 Hint: Remember to account for each mole of product formed.
If the formation enthalpy of CO(g) is -110.5 kJ/mol and that for O₂ is zero, what would be the total ΔH for the reaction: C(s) + O₂(g) → CO(g) using Hess's Law?
💡 Hint: Use the fact that elemental states have zero formation enthalpy.
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