Using the enthalpy$-$composition diagram for ethanol$-$water $($attached$),$ find:a$.$ The enthalpy of a $30$ wt $\%$ ethanol solution at $-20\backslash$deg C and $40\backslash$deg C$.$ What is the heat capacity of thisliquid?b$.$ The enthalpy of a saturated liquid that is $10$ wt $\%$ ethanol.c$.$ The enthalpy of a saturated vapor that is $70$ wt $\%$ ethanol.