Question

In a constant‑pressure calorimeter, 60.0 mL of 0.330 M Ba(OH)2 was added to 60.0 mL of 0.660 M HCl.
The reaction caused the temperature of the solution to rise from 23.65 ∘C to 28.15 ∘C. If the solution has the same density and specific heat as water ( 1.00 g/mL and 4.184J/g⋅°C,) respectively), what is Δ

Answer 1

H⁺ + OH^- = H₂O

n(H⁺) = n(OH^-) = 0.660 ∙ 60 / 1000 = 0.0396

Δ_rH = 4.184 ∙ 120 ∙ (28.15 - 23.65) / 0.0396 = 57054 J ∙ mol^-1 ∙ K^-1 = 57.05 kJ ∙ mol^-1 ∙ K^-1

Answer: Δ_rH = 57.05 kJ ∙ mol^-1 ∙ K^-1.