A 200-gram block of aluminum (Al, 27 g/mole) with an initial temperature T_{Al} = 76.85 °C is brought into contact
with a 500-gram block of copper (Cu, 63.5 g/mole) with an initial temperature T_{Cu} = 26.85 °C.
Together the two blocks reach a final equilibrium temperature T_{F}.

Assume that the blocks only exchange heat with one another, and that the blocks do not change in volume.

Let T_{F} be the final temperature calculated using the Einstein model of solids where each metal
block can be treated as a three dimensional lattice of balls on springs.
The drawing shows two dimensions of the 3-dimensional lattice. Atoms (red balls) oscillate around their nominal positions (blue dots). Springs represent the potential V = (k/2) (x^{2} + y^{2} +
z^{2}).
In this approximation, we find the heat capacity at constant volume using the equipartition theorem.

What is the final temperature of the two blocks in this approximation?