6.1 The weak forces What are they What are the relevant numbers van der waals:0,4-4 kj/mol hydrogen bonds: 12-30 kJ/mol ionic bonds: 20 kJ/mol hydrophobic interactions: <40 kJ/mol6.1 The Weak Forces What are they? What are the relevant numbers? • van der Waals: 0.4 - 4 kJ/mol • hydrogen bonds: 12-30 kJ/mol • ionic bonds: 20 kJ/mol • hydrophobic interactions: <40 kJ/mol