The charcoal from a tree killed in the volcanic eruption that formed a crater contained 43.5% of the carbon-14 found in living matter. if the half-life of carbon-14 is 5700 years, about how old is the crater?

What kind of intermolecular forces act between a hydrogen fluoride molecule and a hydrogen peroxide molecule? note: if there is more than one type of intermolecular force that acts, be sure to list them all, with a comma between the name of each force.