Giving 98 points which statement about enthalpy is true? a.)the enthalpy of formation for a pure element in its standard state is always positive. b.)the enthalpy of formation for a pure element in its standard state is always negative. c.)enthalpy is a state function because its change depends only on initial and final conditions. d.)enthalpy is not a state function because its change depends on the identities of the reactants and products.