What is the total change in enthalpy of this reaction? A. 25 kJ
B. 30 kJ
C. 35 kJ
D. 55 kJ

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

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)]

How many moles of na2s2o3 are needed to react with 0.12mol of cl2? show work.