A solubilidade do cloreto de sódio é de 38g por cada 100 de água, a 20ºC. Adicionou-se 38g deste sal a 50g de água. Calcula a massa de cloreto de sódio que não se dissolveu.

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)]