NaOH + H3PO4 --> Na2HPO4 + H2O what's the number to make these balanced?
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energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.