Practice - Problem 4: Hess’s Law with Formation Enthalpies
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Practice Questions
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What does Hess's Law state?
💡 Hint: Consider how reaction energy is viewed as a state function.
Define Standard Enthalpy of Formation.
💡 Hint: Think about how products are formed from reactants.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is Hess's Law?
💡 Hint: Think about how energy is conserved in chemical processes.
When is the standard enthalpy of formation of an element zero?
💡 Hint: Refer to the definition of formation enthalpy.
1 more question available
Challenge Problems
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Using Hess's Law, calculate the enthalpy change of forming NH₄Cl(s) from nitrogen, hydrogen, and chlorine. Given ΔH_f° for NH₄Cl(s), N₂(g), H₂(g), and Cl₂(g).
💡 Hint: Make sure to check if you need to reverse any equations!
How would varying pressures and temperatures affect your calculations of ΔH using Hess's law?
💡 Hint: Reflect on how enthalpy is dependent on the conditions.
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