Question

In a coffee cup calorimeter, 50 mL of 0.1 M HCl and 50 mL of 0.1 M NaOH are mixed to
yield the following reaction: HCl + NaOH  NaCl + H2O. The two solutions were initially at 22.1 oC and the final temperature is 24.2 oC. Calculate the heat that accompanies this reaction in kJ/mol of H2O formed. Assumed the combined solution has a mass of 100 g and a specific heat of 4.18 J/gK

Answer 1

How many mols H2O were formed? That's 50 x 0.1 = 5.0 millimols or 0.005 mols.

q = heat released = mass H2O x specific heat H2O x (Tfinal-Tinitial)
That is q for 0.05 mols. Convert to J/1 mol and to kJ/mol.

Answer 2

8.778 KJ/Mole