I keep getting “Enthalpy (H)” questions wrong in Chemical Thermodynamics. What's the trap?
getting the sign of ΔH the wrong way round.
The usual trap: getting the sign of ΔH the wrong way round. How to avoid it: heat released → ΔH negative; heat absorbed → ΔH positive. Go back to the definition — the heat content at constant pressure; ΔH is negative for exothermic and positive for endothermic reactions.
Key point
Enthalpy (H)
Common mistake
getting the sign of ΔH the wrong way round.
Memory tip
heat released → ΔH negative; heat absorbed → ΔH positive.
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