Heat of Combustion of paraffin wax
Initial mass of candle 40.3g
Mass of tin calorimeter 41.1g
Mass of half-filled calorimeter with water 220.4g
Initial temp of water 18.8°C
Final temp of water 26.6°C
Final mass of candle 38.2g
Calculate heat of combustion of paraffin wax
Heat of fusion of ice lab
Initial mass of empty cup calorimeter 9.55g
Initial mass of water 200.15g
Initial mass of ice + water 209.7g
Initial temp of water 41.9°C
Initial mass of ice 26.9g
Final mass of cup 9.55g
Final mass of water 227.05g
Final mass of cup + water 236.6g
Final temp of water 26.9°C
Calculate the heat of fusion of ice
To calculate the heat of combustion of paraffin wax, we need to use the principle of energy conservation. First, we need to find the heat energy absorbed by the water in the calorimeter.
1. Calculate the change in mass of water:
Initial mass of water = 220.4g
Final mass of water = 220.4g - (41.1g - 40.3g) (Initial mass of tin calorimeter - Final mass of candle)
Change in mass of water = Final mass of water - Initial mass of water
2. Calculate the change in temperature of water:
Initial temperature of water = 18.8°C
Final temperature of water = 26.6°C
Change in temperature of water = Final temperature of water - Initial temperature of water
3. Calculate the heat energy absorbed by the water:
Heat energy absorbed by water = Change in mass of water * Specific heat capacity of water * Change in temperature of water
The specific heat capacity of water is 4.18 J/g°C.
4. Calculate the heat energy released by the paraffin wax:
Heat energy released by paraffin wax = Heat energy absorbed by water
5. Calculate the heat of combustion of paraffin wax:
Heat of combustion of paraffin wax = Heat energy released by paraffin wax / Mass of paraffin wax burned
The mass of paraffin wax burned is the initial mass of candle minus the final mass of candle (40.3g - 38.2g).
To calculate the heat of fusion of ice, we also need to use the principle of energy conservation. In this case, we'll find the heat energy absorbed by the calorimeter, water, and melted ice.
1. Calculate the change in mass of water:
Change in mass of water = Final mass of water - Initial mass of water
2. Calculate the change in temperature of water:
Change in temperature of water = Final temperature of water - Initial temperature of water
3. Calculate the heat energy absorbed by the water:
Heat energy absorbed by water = Change in mass of water * Specific heat capacity of water * Change in temperature of water
4. Calculate the heat energy absorbed by the calorimeter:
Heat energy absorbed by the calorimeter = Initial mass of cup calorimeter * Specific heat capacity of the cup material * Change in temperature of water
5. Calculate the heat energy absorbed by the melted ice:
Heat energy absorbed by melted ice = Heat energy absorbed by water + Heat energy absorbed by the calorimeter
6. Calculate the heat of fusion of ice:
Heat of fusion of ice = Heat energy absorbed by melted ice / Mass of ice melted
The mass of ice melted is the initial mass of ice (26.9g).