The Einstein model of a crystalline solid gives the following equation for the for the internal energy per mole of crystalline solid, where TE is a characteristic temperature called the Einstein temperature. 3NAKTE CTE/T-1 Use the results of the Einstein model to determine the molar internal energy of diamond (TE=1060 K) at 330 K and 630 K, and thereby the increase in internal energy as diamond is heated from 330 K to 630 K. KJ U330 K U630 K k] k] Δυ