University of Missouri - Columbia

If 50.0 $\mathrm{mL}$ of ethanol (density $=0.789 \mathrm{g} / \mathrm{mL} )$ initially at $7.0^{\circ} \mathrm{C}$ is mixed with 50.0 $\mathrm{mL}$ of water (density $=1.0 \mathrm{g} / \mathrm{mL} )$ initially at $28.4^{\circ} \mathrm{C}$ in an insulated beaker, and assuming that no heat is lost, what is the final temperature of the mixture?