In an coffee cup calorimeter experiment, sodium hydroxide (7.17 g) was dissolved in water (86.6 g). The initial temperature of both were 11.5 oC. When the sodium hydroxide is dissolved, the solution reached a maximum temperature of 34.1 oC. The specific heat of the solution is 3.98 J∙g -1∙ oC -1. Use NaOH as the limiting reactant, calculate the molar enthalpy change of the solvation of NaOH in water (Δ Hrxn), in the unit of kJ/mole

A 100.0 mL sample of 0.250 M NaOH is mixed with a 150.0 mL sample of 0.280 M HNO3 in a coffee cup calorimeter.  Both solutions were initially at 35.00°C and after mixing, the temperature of the resulting solution was recorded as 37.00°C. Determine the enthalpy of neutralization (ΔH°neutralization rxn) (in units of kJ/mol) for the neutralization reaction between aqueous NaOH and HNO3.  The specific heat capacity of water = 4.184 J/g°C and density of water = 1.00 g/mL Assume 1) that no heat is lost to the calorimeter or the surroundings, and 2) that the density and the heat capacity of the resulting solution are the same as water.    Hint: Heat of neutralization is the enthalpy change per mol of water formed in a neutralization reaction. Write the balanced equation, calculate the limiting reactant and the mol of water formed in the reaction. Enter the numerical value clearly indicating whether it is endothermic or exothermic.

The aromatic hydrocarbon cymene (C10H14) is found in nearly 100 spices and fragrances including coriander, anise, and thyme. The complete combustion of 1.608 g of cymene in a bomb calorimeter (Ccalorimeter = 3.640 kJ/°C) produced an increase in temperature of 19.35°C. Calculate the molar enthalpy of combustion of cymene (ΔHcomb) in kilojoules per mole of cymene.

50.0 mL of a solution of HCl is combined with 100.0 mL of 1.05M NaOH in a calorimeter. The reaction mixture is initially at 22.4°C, and the final temperature after reaction is 30.2oC. What is the molarity of the HCl solution? You may assume that there is an excess of base (so that all the HCl has reacted), that the specific heat of the reaction mixture is 0.96 cal/g °C, and that the density of the reaction mixture is 1.02 g/mL. The heat of neutralization of HCl and NaOH is 13.6 kcal/mole.