The candle lab: calculations. Data: 0.95 g, 30.6 ° C 1. q = heat/energy change, units: J or Joules c = specific heat, units: J/g ° C m = mass, units: g or grams T= temperature change, units: ° C 2. 200 g 3. q = cm T = 4.18 J/g ° C x 200 g x 30.6 ° C
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Data: 0.95 g, 30.6 °C
q = heat/energy change, units: J or Joules
c = specific heat, units: J/g°C
m = mass, units: g or grams
T= temperature change, units: °C
2. 200 g
3. q = cmT = 4.18 J/g°C x 200 g x 30.6 °C
= 25 582 J or 25.6 kJ
= 26.9 kJ = 27 kJ
5. First, assume the heat absorbed by the water is equal to the heat released by the candle
1 mol C25H52 = 352 g or 352.52
#mol= 0.95 gx 1 mol / 353 g= 0.00269 mol
kJ/mol = 25.581 kJ / 0.00269 mol
= 9 510 kJ/mol = 9.5 x 106 J/mol
6. Calorimeter: An apparatus used in the determination of the heat of a reaction
Calorimetry: The science of measuring the quantities of heat that are involved in a chemical or physical change.
Other sources of error include anything that interferes with the transfer of heat or the measurement of that heat. E.g. incomplete transfer of heat, loss of heat, evaporation of water, incomplete combustion.
Not:experimental error, inaccurate thermometer
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