title: Hydrogen bond
context: Hydrogen bonds can vary in strength from weak (1–2 kJ mol−1) to strong (161.5 kJ mol−1 in the ion HF− 2).[11][12]  Typical enthalpies in vapor include:
question: How strong is a hydrogen bond?
answers: from weak (1–2 kJ mol−1) to strong (161.5 kJ mol−1 in the ion HF− 2