Remember that the slower the temperature changes, the amount of heat is the same. So basically the amount of substance is what determines how much heat there is available for the temperature to change.After that you calculate.
is an weak base. HF is an weak acid. Hence an acid-base reaction will ocuur between and HF resulting a homogeneous mixture.
is a polar protic molecule. Hence it can form hydrogen bonding with another polar protic molecule . Also dipole-dipole attraction force along with london dispersion force exists between and .
is a polar molecule. Hence only dipole-dipole attraction force along with london dispersion force operates between and .
is a non-polar molecule. Hence only london dispersion force exists between and .