The vapor pressures of 1,2-diphenylethane, p-dichlorobenzene, 1,3,5- trichlorobenzene are 0.06, 11.2, and 1.4 torr, respectively, at their melting points (52-54 oc). explain which compound is likely to be sublimed most rapidly at a reduced pressure of 15 torr and a temperature of 40 oc.

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]