experiment instructions below (read before doing question)

Part B1: Enthalpy of Combustion of Paraffin Wax (Basic calorimeter) Table B.1. Experimental Data for the Combustion of Paraffin Wax

Mass of aluminum can	38.54
mass of aluminum can and water	137.69
mass of water
Initial mass of paraffin wax candle (before the experiment)	10.27
Final mass of paraffin wax candle (after the experiment)	10.56
Mass of paraffin wax consumed
Initial temperature of water and aluminum can calorimeter	22.9
Final temperature of water and aluminum can calorimeter	23.3
change in tempature

a. Calculate the molar enthalpy of combustion for paraffin wax.(use table) Show all your work for calculation of Hcombustion. Be sure that you have included units throughout your calculations and that your final answer has the correct number of significant figures.

b. Compare your experimental value with the theoretical value and calculate your % error. The theoretical value for the molar enthalpy of combustion of paraffin wax is 15300 kJ/mol. (1 mark) % = | / | 100

experiment instructions below (read before doing question)

PART B1: Determining the Enthalpy of Combustion of Paraffin Wax using an Aluminum Can Calorimeter

1. Obtain a candle that is made of paraffin wax, and measure the mass of the candle using a top-loading balance. Record this mass in Table B.1.

2. Obtain an aluminum can. Use steel wool to clean the aluminum can if it is sooty. Measure the mass of can on the same top-loading balance. Record this value in Table B.1.

3. Using a 100 mL graduated cylinder, add 100 mL of tap water to the aluminum can.

4. Measure the mass of the aluminum can with water on the same top-loading balance. Record this value in Table B.1.

5. Measure and record the initial temperature of the water. Record this value in Table B.1.

6. Assemble the equipment so that it resembles the flame calorimeter depicted in Figure 1.

7. Light the candle with a butane lighter, and place the candle beneath the aluminum can. Adjust the aluminum can so that the flame just touches the bottom of the aluminum can.

8. Start the timer and allow the candle to burn for 6 minutes. Carefully extinguish the candle so that you do not spill any wax. Watch the temperature for about one minute, and record the highest temperature that is reached.

9. Measure the final mass of the paraffin wax candle on the same top-loading balance. Record this value in Table B.1.

10. Pour the water out of the can. If the can is sooty, clean with steel wool. Figure 1: Aluminum Can Calorimeter