Question

2. (12 pts List the reference values for AG and Sof each reaction component and calculate AG and As for the reaction. Using AG, and the average of the experimentally determined value for AH in this experiment, report a semi-experimental value for AS (assume standard tem perature). Compare this value to the theoretical value (AS ) and calculate a percent error. What would cause any variance? (You must show your calculations. You can use the left page for extra space.) Reaction Component AG, (kJ/mol) S (J/mol.) Ca(s) HO(1) Ca(OH),(s) H (8) 3. (2 pts) Does the sign on the experimental entropy value agree with the type of change? Titration Part Molarity HCI Trial 1 | Trial 2 om 6M Initial Buret Final Buret Volume of HCI Reading Reading 10.00 mi 8.60ml 8.60ml 8.60 ml 16.01 mL 7.41 mL (2 pts) 4. (2 pts) Calculate the number of moles of OH formed. (Must show calculation for each trial.) 5. (2 pts) Determine the ratio of moles of OH / moles of Ca? (Must show calculation for each trial.)

Answer 1

We also remember the formula':- As theoretical = nS product - Enso de artant = (83.4 +130) – [4106+(2x69.00 = 213.4 - 181.4 2. As the araticad = 32 5/mal-K] Average AH in the experiment i = -343. 38

We know that | Aliexn = 41 - OTS => -422.32 = (-3 43.39) - (4 Tabomi) => A1$ = -3 43.38 + 4 22.32 s. 78.94 Standard temperature means samo 273 OC = (27370)K ::4$ semi = 0.28923/melk > 0 Ssemi = 273K

We compare this two value of as :- ol Fie l. 4 Ssemi. -- 4S theoretical L x100 45 theoretical 10.2892- 32 l xico 32 % Errar = 99.1%)