Pentane (C5H12) has a vapor pressure of 0.67 atm, while hexane (C6H14) has a vapor pressure of 0.19 atm. If 0.53 moles of pentane and 0.86 moles of hexane are mixed, what is the vapor pressure of the resulting solution (assume 25oC throughout)

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)]