6.8 Enthalpy of Formation/ AP CHEM

0.0(0)
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/4

encourage image

There's no tags or description

Looks like no tags are added yet.

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

5 Terms

1
New cards

standard enthalpy of formation (ΔH◦f)

  • represents change in enthalpy when a substance forms

  • standard enthalpy formation (ΔH◦f) can be used to estimate overall enthalpy change of a rxn (ΔH◦rxn)

2
New cards

◦

ΔH is measured under standard conditions

  • temp (l) (s) = 25°C

  • Pressure (g) (l) (s) = 1 atm

  • Concentration (aq) = 1 M

easy to compare across substances

3
New cards

ΔH◦f of a pure element in its standard state is always…

ΔH◦f (KJ/mol) = 0

4
New cards

pure element

  • all elements on the periodic table (Mg, Au, Co)

  • diatomic elements (HOFBrINCl) are 2 (H2, O2, F2)

5
New cards

ΔH◦rxn =

ΔH◦rxn = ΣΔH◦f(products) - ΣΔH◦f(reactants)