learn.howToCalculate
learn.whatIsHeading
Thermochemistry measures heat involved in reactions: ΔH (enthalpy change), ΔS (entropy change), ΔG (Gibbs free energy).
ステップバイステップガイド
- 1Input reaction and temperature
- 2Calculate ΔH from bond energies or Hess's law
- 3Determine spontaneity: ΔG = ΔH - TΔS
解いた例
入力
Combustion: exothermic (ΔH < 0), entropy increases (ΔS > 0)
結果
Spontaneous at all temperatures (ΔG < 0)
避けるべきよくある間違い
- ✕Assuming exothermic always spontaneous
- ✕Not accounting for temperature dependence
よくある質問
When is reaction spontaneous?
ΔG < 0; depends on temperature through ΔH - TΔS balance.
計算する準備はできましたか?無料の Thermochem 計算機をお試しください
自分で試してみる→