19. When 1.00 L of 1.00 M barium nitrate solution at 25.0℃ is mixed with 1.00 L of 1.00 M sodium sulfate solution at 25.0℃ in a calorimeter, the white solid barium sulfate forms, and the temperature of the mixture increases to 32.1℃. Assuming that the calorimeter absorbs only a negligible quantity of heat, the specific heat capacity of the solution is 4.18 J/℃ · g, and the density of the final solution is 1.0 g/mL, calculate the enthalpy change per mole of barium sulfate formed.
(A) 59 KJ/mol
(B) -59 KJ/mol
(C) 30 KJ/mol
(D) -30 KJ/mol
(E) 89 KJ/mol

詳解 (共 1 筆)

cute_shiba

B1 · 2025/04/09

#6364543

Temperature change：7.1∘C

Total volume：2.00 L

Mass：2.00 L×1.0 g/mL=2.00 L×1000 g/L = 2000g

Specific heat capacity：

放熱反應，取負值

1

0