How many moles of solid naf would have to be added to 1.0 l of 2.39 m hf?

Molarity is one way of expressing concentration and is equal to the number of moles of the solute per liter of the solution. Therefore,

Molarity = 2.39 mol / L solution

2.39 ( 1.0) = 2.39 mol HF

Hope this answers the question.

Neither model is able to show the reactivity of potassium.

Are you going to give an example of the plant or?