Question

Vas 25.0°C. rises to AH and Calorimetry: 8. Suppose 33mL of 1.20M HCl is added to 42mL of a solution containing excess sodium nydroxide in a coffee-cup calorimeter. The solution temperature, originally at 25.0°C, rises to 31.8°C. COMPARE ANSWER WITH PROBLEM #9. 2pts a. Provide a thermochemical equation, including AH in kJ. (include sign) b. What is the energy (AH) evolved in kJ per mole of HCI? include sign) For simplicity, assume the heat capacity and the density of the final solution are those of H20. (Note: in more accurate work, these values are not the same and must be calculated). Also assume that the total volume of the solution equals the sum of the volumes of HCl(aq) and NaOH(aq). work space Provide a thermochemical equation. a) Nad + HO HCl + NaOH - (aq) (aq) (1) b. d hoot

Answer 1

8. @ due to Temperat Temperature reaction b/w increased es ^ Naot & Hull re total - Het Naota Nachant Holt al volume of solution mixture I - = 33m2 + 42ml = 75 m2 me density of water or solution = 1 g/me mais = volime x density = 75 yll x 1g/my - 759 Heat absorbed = mSAT = DH m man mixture S = Specific heat Copacity at = change in temperature 759 x 4.184 Ilgo cx (31.8-25) = 2133.84 J = 2.1338 kJ moles of Hel = 0.0332 8 1.20m 0.0396 moles 10.0396 moles Imole will produce produces 2133.847 = 53884.84 I lanol = 53.88 KJ / omole Ang