In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

The negative ratio of this quantity to the gas constant is equated to the derivative of the natural log of equilibrium constant over the derivative of the natural log of inverse temperature. During throttling processes, this quantity remains constant, and for isochoric processes, this quantity is simply equal to the change in internal (*) energy. The standard heat of formation is this quantity for the formation of 1 mol of a compound. This quantity for the conversion of a gas to an ionic solid is reported as the lattice energy, and this quantity has units of joules per kilogram. For 10 points, name this quantity which is equal to the product of pressure and volume of a system plus its internal energy, which is usually denoted H.
Science