# Calometer Lab

Essay by iamhereHigh School, 11th gradeA+, May 2006

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Cheetos Combustion Assignment

Data Collection

Mass of the Cheetos, Calorimeter and Measure of the Temperature and Volume of Water

Trial Number Before Mass of Cheetos [g] ÃÂ± 0.01g After Mass of Cheetos [g] ÃÂ± 0.01g Mass of Calorimeter [g] ÃÂ± 0.01g Volume of Water [mL] ÃÂ± 0.01mL Temperature of Water Before Heating [ÃÂ°C] ÃÂ± 0.1ÃÂ°C Temperature of Water After Heating [ÃÂ°C] ÃÂ± 0.1ÃÂ°C

1 4.74 0.12 27.90 50.00 25.0 91.0

Qualitative Observations

Cheetos are changing from orange to black in color as they are burned.

The flames are coming out of the oxygen holes.

Smoke is coming out of the oxygen holes.

Data Processing and Presentation

Change in Temperature

Tchange = Tafter - Tbefore

Tchange = 91.0ÃÂ°C - 25.0ÃÂ°C

Tchange = 66.0ÃÂ°C

Change in Mass

mchange = mafter - mbefore

mchange = 4.74g - 0.12g

mchange = 4.62g

Amount of Heat Gained By Water

-let c be the specific heat capacity of water

Heat = mwater * cwater * Ã¢ÂÂT

Heat = 50.00g

* 4.184j/gCÃÂ° * 66.0ÃÂ°C

Heat = 13 807.20J

Amount of Heat Gained By Calorimeter

-let c be the specific heat capacity for aluminum

Heat = mcalorimeter * ccalorimeter * Ã¢ÂÂT

Heat = 27.90g * 0.897j/gCÃÂ° * 66ÃÂ°C

Heat = 1 651.7358J

Total Heat Gained

Htotal = Hcalorimeter + Hwater

Htotal = 13 807.20J + 1 651.7358J

Htotal = 15 458.94J

Conversion From Joules to Kilojoules

16 458.94J = x kJ

16437.73J = 15.5kJ

Amount of Heat Gained from 50g of Cheetos

-let x be the amount of heat gained from 50g of Cheetos

16.5kJ/4.62g = x kJ/50g

x = 167.7kJ

Conclusion

Conversion From Kilocalories to Kilojoules

290kilocalories * 4.184kilojoule/kilocalorie = 1.21*103kilojoules

Percentage Error

Perror = [|[actual value - theoretical value]| / theoretical value] * 100%

Perror = [|[167.7kJ - 1.21*103...