Question: latent heat of vaporization for water in j/kg
[{'answer': '40.65 kJ / mol'}, {'provenance': [{'wikipedia_id': '37710', 'title': 'Enthalpy of vaporization', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 1215, 'bleu_score': 0.974195933880952, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6076967332952470674}, 'section': 'Section::::Thermodynamic background.\n'}]}]