1. How long (in seconds) will it take to heat 40 kg of water from 40°C to 80°C with a 20-kW immersion heater? Assume no energy is lost to the environment and specific heat of water is 4.186 kJ/kgoC. 2. The heat of vaporization of water is 2260 kJ/kg and the heat of fusion of water is 335 kJ/kg. Use the specific heat of water is 4.186 kJ/kg·oC 2a) How much energy (in kJ) will it take to raise the temperature of water (15 kg) from 0°C to 100oC? 2b) How much energy (in kJ) would it take to then completely convert the water to steam? 3. You want to raise the temperature of 22kg of water from 60°C to 95°C. If electricity costs $0.08/kWh, how much would it cost you to use an electric heater for this process? Use the specific heat of water is 4.186 kJ/kgoC and 1 kJ = 0.00028 kWh.
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
1. How long (in seconds) will it take to heat 40 kg of water from 40°C to 80°C with a 20-kW immersion heater? Assume no energy is lost to the environment and specific heat of water is 4.186 kJ/kgoC.
2. The heat of vaporization of water is 2260 kJ/kg and the heat of fusion of water is 335 kJ/kg. Use the specific heat of water is 4.186 kJ/kg·oC
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- 2a) How much energy (in kJ) will it take to raise the temperature of water (15 kg) from 0°C to 100oC?
- 2b) How much energy (in kJ) would it take to then completely convert the water to steam?
3. You want to raise the temperature of 22kg of water from 60°C to 95°C. If electricity costs $0.08/kWh, how much would it cost you to use an electric heater for this process? Use the specific heat of water is 4.186 kJ/kgoC and 1 kJ = 0.00028 kWh.
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