# Change of heat capacity fluid when you add solvent

I am considering a liquid for which I know $C_p$ or $C_v$. I am wondering how this changes when you add a (minor) amount of solvent to the liquid. Is there a general theory around describing how a random liquid's heat capacity changes when you add a random solvent? Or is it a very specific process for the particular liquid and solvent one considers? References to literature would be very much appreciated!

$C_m$ = $g_1 * C_1 + g_2 * C_2$
$C_m$ = $x_1 * C_1 + x_2 * C_2$
$g$ and $x$ are mass and mole fractions of the components.