Mistake Master
Mistake Master · AP Chemistry · Unit 6 · Step-Through Animation
Two Roads, One Answer
You'll learnto find an unmeasurable ΔH by combining reactions you can measure, adjusting each ΔH the same way.
Nobody has ever measured the enthalpy of C(graphite) + ½ O2 → CO directly, because burning carbon in limited oxygen always leaves a mixture. And yet the number is known to one decimal place. Twelve short steps; press Next for each one.
two roads down, and they have to land together
Before you start
What you're looking at
An enthalpy landscape: three amber levels, with a cyan arrow marking the drop nobody can measure.
The question
How is that ΔH known to a tenth of a kilojoule if no calorimeter can measure it?
Step 1 / 12