According to Hess's Law the enthalpy change of a given reaction depends only on the reactants and products and is independent of the reaction pathway the enthalpy change of a given reaction is the difference between the enthalpy of formation of the products and the enthalpy of formation of the reactants O if a reaction can be achieved through a number of steps, then the enthalpy change for the reaction is the same as the sum of the enthalpy changes for all the steps all of these are related to Hess's Law When 145.6 J of heat are added to 13.0 g of mercury in a thermometer, the temperature increases from 20.0 C to 100.0 C. What is the specific heat capacity of the mercury? 07.14 J/gC 379 J/gC 0.14 J/9C 151 kJ/9C When 0.0179 moles of barium react with chlorine, 15.4 kJ of energy are produced. How much heat is produced when 1.00 mole of barium reacts? 55.7 kJ O 0.276 kJ 6.26 kJ 860. KJ Which of the following devices is used to directly measure the energy content of a system in joules: O a combustion calorimeter O a thermometer heat energy cannot be measured directly O a coffee cup calorimeter Consider the reaction: Sn + 2Cl2 SnCl4 + 545 kJ What is the enthalpy change for: 25nCl4 2 Sn + 4Cl2 AH = ? +545 kJ - 1090 kJ 545 kJ + 1090 kJ