This study source was downloaded by 100000755067623 from CourseHero com on 01 12 2023 10 42 16 GMT 06 00 https www coursehero com file 48579389 Lab Molar Heat of Combustion of Fueldocx Lab Molar Heat of Combustion of FuelProblemWhich fuel methanol or ethanol is better for heating water in a camping stove PredictionFind the theoretical molar heat of combustion and energy per gram of fuel burned for methanol and ethanol DesignEach fuel will be burned for two minutes and the temperature change of the water and the tin can will be used in calculating the molar enthalpy of combustion of each fuel Procedure1 Measure the mass of the small tin can and record in table 2 Assemble the tin can apparatus as shown on the board 3 Measure 100 0 mL of water using a graduated cylinder and pour into the small tin can 4 Measure the initial temperature of the water and record 5 Measure the mass of the alcohol burner with the cap and record in table 6 Ignite the burner and allow flame to heat tin can and water for two minutes 7 Extinguish the flame by placing the cap on it with tongs and measure the final mass of the alcohol burner 8 Repeat step 3 to 7 for the other alcohol burner EvidenceMass of tin can 35 20gInitial Mass of Alcohol Burner g Final Mass of Alcohol Burner g Initial HO l Temperature Final HO l Temperature Methanol169 65g167 60g20 0 64 0 Ethanol185 80g184 20g21 0 70 0 AnalysisMethanol rHm mc tn rHm 0 100kg 4 18kJkg K 44 0K 0 0352kg 0 227kJkg K 44 0K 2 05g mol32 04g rHm 292 9484031kJ mol rHm 293kJ mol rH 293kJmol 32 04gmol This study source was downloaded by 100000755067623 from CourseHero com on 01 12 2023 10 42 16 GMT 06 00 https www coursehero com file 48579389 Lab Molar Heat of Combustion of Fueldocx Powered by TCPDF www tcpdf org rH 9 143208585kJ g rH 9 14kJ gPercent Error 725 9kJmol 293kJmol 725 9kJmol x 100 59 6 Ethanol rHm mc tn rHm 0 100kg 4 18kJkg K 49 0K 0 0352kg 0 227kJkg K 49 0K 1 60g mol46 07g rHm 601 0271929kJ mol rHm 601kJ mol rH 601kJmol 46 07gmol rH 13 045956kJ g rH 13 0kJ gPercent Error 1366 8kJmol 601kJmol 1366 8kJmol x 100 56 0 Conclusion and EvaluationEthanol is better for heating water in a camping stove because it releases more energy per gram of ethanol burned In this lab our percent error for burning methanol was approximately 59 6 and our percent error for burning ethanol was approximately 56 0 these percent errors could have been caused by some of the errors that have occured in the lab An example of an error in the lab was that we did not ignite the burner immediately after taking the cap off so some heat might ve already been lost a way we can minimize the extent in which this error affects the final results of our lab is to have one person take the cap off after the match has been lit and have the other person light it up instead of only having one person do it Another example of an error in this lab is that our thermometer touched the tin can when measuring the temperature of the water this could have affected the result of our final temperature