Latent heat of vaporisation
Solution
The latent heat of vaporization is the amount of heat energy required to change a substance from a liquid phase to a gaseous phase at a constant temperature and pressure. Here's a step-by-step explanation:
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Consider a substance in a liquid state.
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To convert this substance from a liquid to a gas, we need to supply heat. This heat is used to overcome the forces of attraction between the molecules of the substance.
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The amount of heat energy required to convert 1 kg of a substance from the liquid state to the gaseous state without any change in temperature is known as the latent heat of vaporization.
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It's called 'latent' because it is hidden, as during the phase change process, the heat energy is used to change the state of the substance, not to increase its temperature.
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The latent heat of vaporization is a specific property of the substance. For example, the latent heat of vaporization for water is approximately 2260 kJ/kg at standard atmospheric pressure.
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The formula to calculate the heat absorbed or released during the phase change is Q = mL, where Q is the heat absorbed/released, m is the mass of the substance, and L is the latent heat of vaporization.
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This concept is crucial in many natural and industrial processes such as boiling water, refrigeration systems, and power plants.
Similar Questions
The latent heat of vaporization describes:A.the amount of heat a substance must release to transition from the liquid to the gas phase.B.the amount of heat a substance must absorb to transition from the liquid to the gas phase.C.the amount of heat a substance must release to transition from the solid to the gas phase.D.the amount of heat a substance must absorb to transition from the solid to the gas phase.
What is the latent heat of vaporization?A.The energy required to break molecular bondsB.The energy required to go from a solid to a gasC.The energy required to go from a solid to a liquidD.The energy required to go from a liquid to a gas
Latent heat of vaporization isthe amount of heat required to raise the temperature of a 1 kg of a substance by 1 Kthe amount of heat required to raise the temperature of a substance by 1 Kthe amount of heat required to change the phase of a substance from solid to liquid without any change in temperaturethe amount of heat required to change the phase of a substance from liquid to gas without any change in temperature
Which of the following processes involves latent heat of vaporization?A. BoilingB. MeltingC. FreezingD. Condensation
What information does the latent heat of vaporization give?A.The energy needed to completely melt a mole of a solidB.The energy needed to raise the temperature of 1 g of a vapor 1°CC.The energy needed to heat a liquid from freezing point to boiling pointD.The energy needed to completely vaporize a mole of a liquid
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