A 100. mL sample of 0.200 M aqueous hydrochloric acid is added to 100. mL of 0.200 M aqueous ammonia in a calorimeter whose heat capacity (excluding any water) is 480. J/K. The following reaction occurs when the two solutions are mixed.
HCl(aq) + NH3(aq) → NH4Cl(aq)
The temperature increase is 2.34°C. Calculate DH per mole of HCl and NH3 reacted.
(A) 154 kJ/mol
(D) –1.96 kJ/mol
(C) 485 kJ/mol
(E) –154 kJ/mol
