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2 cards from this section. Quick, good the night before a test.
What does Hess's Law state?
Think about how paths in a forest can lead to the same destination.
Why is Hess's Law useful in chemistry?
Consider how we can combine known equations to predict unknown properties.
What is Hess's Law?
Think about how energy can be conserved regardless of the steps taken.
If a reaction is reversed, what happens to its ΔH?
Reversing means considering energy to be absorbed instead of released.
Given the reactions: A + B → C (ΔH = -40 kJ) and C + D → E (ΔH = -60 kJ). Find ΔH for the overall reaction: A + B + D → E.
Combine the enthalpy changes directly; balancing is taken care of in the equation!
A formation reaction: 3 H₂ + N₂ → 2 NH₃ (ΔH = -92 kJ). If we reverse this equation for calculating ΔH of decomposition, what will be the resulting enthalpy?
Remember that reversing a reaction changes the context of energy transfer!
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