1)A coffee cup calorimeter was used for the neutralization reaction of 100 mL of 1.00 M hydrochloric acid with 100 mL of 1.20 M sodium hydroxide. The initial temperature was 22.88 °C and the final temperature was 29.39 °C. Calculate the calorimeter constant for the reaction. HCl (aq) + NaOH (aq) NaCl (aq) + H2O (?H°rxn = -58.3 kJ/mol)
2)The same calorimeter was used for the dissolution of 8.86 g sample of lithium chloride in 100.0 mL of water at 22.2 °C. When the salt was dissolved, the temperature of the solution was 39.5°C. Calculate the molar enthalpy of solution of lithium chloride. Is the dissolution of lithium chloride endothermic or exothermic? [The density of water is 1.0 g/mL.]