A. Sample Preparation and Setup Apparatus Calculation of mass ofcaco sample for

Question

A. Sample Preparation and Setup Apparatus Calculation of mass ofcaco sample for analysis (from Prelaboratory Assignment, question 2). 40ml .00 Trial 2 Unknown sample no. Trial I 1. Mass of sample (g) 175.3 /73 210 2. Mass of generator sample before reaction (g) Instructor's approval of apparatus C. Determination of volume, Temperature, and Pressure ofthe Carbon Dioxide Gas 5 mL. 1. Initial reading of volume of water in COrcollecting graduated cylinder (ml) 55 mL 2 Final reading of volume of water in co collecting graduated cylinder (ml) 3. Volume of CO(g) collected (L) 4. Temperature of water (e) 5. Barometric pressure (torr) 6 vapor pressure of Hizo at c(torr) Pressure of dry con(g) (torr) D. Amount of Carbon Dioxide Gas Evolved 1. Mass of generator sample after reaction (g) 2 Mass loss of generator mass coh evolved (g) Moles of co, evolved (mo) Experiment 13 187

Explanation / Answer

CaCO3 --> CaO + CO2

E.

a. pressure of dry CO2 = 728.2/760 = 0.758 atm

b. Volume of CO2 = 0.03 L

c. molar volume of CO2 = 0.03/0.00254 = 11.86 L/mol

Similarly for trial 2 can be done

F.

a. moles of CaCO3 = 0.00254 mol

b. mass of CaCO3 = 0.00254 x 100.088 = 0.2545 g

c. original mass of sample = 0.1802 g (this value cannot be lower than b.)

d. percent CaCO3 in sample = (0.2545/value from c.) x 100

similarly for trial 2 can be doen to calculate average of the two values

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