a tank full of xenon gas has a volume of 696 l. when the gas is transferred to a new tank the pressure is measure at 3.52 torr and the volume is 423 l. what was the original pressure?
boyle's law p1v1=p2v2

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)]