Consider these changes.
(a) hg(l)-> hg(g)
(b) 3o2(g)-> 2o3(g)
(c) cuso4*5h2o(s)-> cuso4(s)+5h2o(g)
(d) h2(g)+f2(g)-> 2hf(g)

at constant pressure, in which of the reactions is work done by the system on the surroundings? by the surroundings on the system? in which of them is no work done?

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)]