Question

10 Question (1 point) B See page 236 A 98.2 mL sample of 1.00 M NaOH is mixed with 49.1 mL of 1.00 M H2SO4 in a large Styrofoam coffee cup; the cup is fitted with a lid through which passes a calibrated thermometer. The temperature of each solution before mixing is 21.85 °C. After adding the NaOH solution to the coffee cup and stirring the mixed solutions with the thermometer, the maximum temperature measured is 32.50 °C. Assume that the density of the mixed solutions is 1.00 g/mL, that the specific heat of the mixed solutions is 4.18 J/(g°C), and that no heat is lost to the surroundings. 1st attempt Part 1 (0.3 point) W See Periodic Table Write a balanced chemical equation for the reaction that takes place in the Styrofoam cup. Remember to include phases in the balanced chemical equation x | x He a l, 8. Part 2 (0.3 point) Is any NaOH or H2SO4 left in the Styrofoam cup when the reaction is over? Choose one: A. No B. Yes Part 3 (0.3 point) See Hint Calculate the enthalpy change per mole of H2SO4 in the reaction. kJ/mol

Answer 1

Part 1: 2NaOH(aq) + H2SO4 (aq) N9254199) + 2H₂O (1) Part2: moles of Maoha volume (L) x melarity (melly) = 0.0982 L xl.com = 0.0982 mer moes of H2504 = 0.0491 LX 1.oom = 0.049 imel a med nach requirex 1 mel 42509 i. 0.0982 mel Nach requires 1 mol M₂5C4 X 00982 mes 2 me : = 0.0491 mol H2S ce so answer No (B) part3: Heat released ; = – Meat Now m= (98.2 mL +49.1ML ) x 1.oogmat = 147. 39 (m= veler exclensity) :.30 = - 197139 x 4.181/9°C X (32.50°C - 21.85°C) 5 - 6557.35 J for 0.049) mel M2509 ; Q=-65573 SJ Per 1 ml " a = 8M = -6557.35J = -133.SS kJ mor) 0.ogg imel Dangwer