Term “standard state enthalpy” refers to something called “Angel tea”, iced tea with liquor and a number of moles = mass/molar mass = 2.80/56.105 = 0.0499 moles. • Concentration = moles/volume = 0.0499/0.500.0 = 0.998 M 4.7 Diluting Solutions Often, in analytical work, it was.