Calorimetry Essay

688 WordsFeb 19, 20133 Pages
Part 1 |Distilled water volume |201 mL | |Constant initial temperature |24.5 C | |NaOH Mass |2.535 g | |Final temperature |27.8 C | 1. Write out a balanced "equation" for the process you investigated in Part I, including phase symbols. NaOH(s) + H2O(l) --> NaOH(aq) 2. Calculate the number of moles of sodium hydroxide dissolved. Show your work. Moles NaOH = 2.535 grams NaOH x (1 mol/40.00 grams) = 0.06338 moles NaOH 3. Calculate the amount of energy involved in this dissolving process. Show your work. q = m c (T2-T1) 200 mL H2O X 1 g/1 mL = 200 g H2O c = 4.184 J/gC T2 = 27.8 C T1 = 24.2 C 200 g X 4.18 J/gC X (27.8 - 24.2) = 3010 J 4. Determine the enthalpy change, per mole of sodium hydroxide dissolved. Show your work. 3010 J / 0.06338 mol NaOH = 4.75X10^4 J/mole X 1 kJ/1000 J = 47.5 kJ/mol NaOH Part 2 |HCL Solution |100.5 mL | |NaOH Solution |100.5 mL | |Initial HCL temperature |25.2 C | |Mixed Solution Temperature |28.2 C | 1.Write out a balanced equation for the reaction you investigated in part II,