Question

12:47 1 Exit Question 1 0.5 pts When 34.8 g of sodium chloride is dissolved in water, 2.31 kJ of energy is absorbed. Is the enthalpy of dissolution of NaCl exothermic or endothermic? Endothermic Exothermic Question 2 0.5 pts What is the balanced thermochemical equation for the combustion of two moles of gaseous acetylene, C2H2, with oxygen to produce carbon dioxide and water vapor at 24.59°C given that 2512 kJ of heat is released at a constant pressure of 1.14 atm? Fill in the values for the coefficients, phase labels, and enthalpy. C₂H21

Answer 1

1.0 Emdothermic as energy is absorbed 2.2 Cq Hq (g) + 5 O₂(g) → 4 CO2 19h+ 2 H₂O(g) AH Z - 2512 KJ 3. Mole of PA = 232.bg = 1.876 mol = - 232.bg 124gimos su= 1.876m X - 3013 = = 5652] kJ 4. Extensive Property - Mass - Enthalpy 5. Ice melting O exothermic 6. DH = 3.973 J x 1.29 x (27.27- 23.63) 6. Dn. Olig • 17.354 J Mole - 1.2 g - 103.6g limos - 0.0 1 1 58 mol = 1498.2 l mos DH = 17.354 J 0.01 158 mol = 1.59 kJ/mol 7. q = 2.42 * 53.39 * (223 k) = 2876.39 J = 2.88 kJ