Heat Of Fusion Formula - Definition, Formula, Solved Questions
Heat Of Fusion Formula: The heat of fusion, also known as the enthalpy of fusion, is the amount of heat energy required to change a substance from a solid to a liquid state at its melting point.
Murtaza Mushtaq25 Oct, 2023
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Heat of Fusion Definition
Heat Of Fusion Formula: The heat of fusion, also known as the enthalpy of fusion, is the amount of heat energy required to change a substance from a solid to a liquid state at its melting point. This process occurs at a constant temperature and pressure. The heat of fusion is typically represented by the symbol ΔHf.Formula for Heat of Fusion
Heat Of Fusion Formula: The formula to calculate the heat of fusion is: ΔHf = q / m Where: - ΔHf is the heat of fusion (in joules or calories) - q is the heat energy added or removed (in joules or calories) - m is the mass of the substance undergoing the phase change (in grams) The heat of fusion can be different for various substances, as it depends on the specific material in question. For water, for example, the heat of fusion is approximately 334 joules per gram. If you need more information or have any specific questions related to this topic, please let me know.Solved Examples Of Heat Of Fusion Formula
- Calculate the heat of fusion for 100 grams of ice when it melts at 0°C.
- A 200-gram sample of a substance requires 20,000 J of heat to melt. Calculate the heat of fusion for this substance.
- Find the heat energy required to melt 50 grams of wax with a heat of fusion of 200 J/g.
- Calculate the mass of ice that can be melted with 5,000 J of heat energy.
- If 150 J of heat is added to melt 10 grams of a substance, find its heat of fusion.
- A metal with a heat of fusion of 1000 J/g changes from a solid to a liquid with the addition of 500 J of heat. Calculate the mass of the metal.
- Determine the heat energy required to melt 250 grams of lead with a heat of fusion of 23 J/g.
- If it takes 1200 J of heat to melt a 60-gram sample of a substance, find its heat of fusion.
- Calculate the heat energy needed to melt 75 grams of a substance with a heat of fusion of 400 J/g.
- A 300-gram block of a substance requires 90,000 J of heat to melt. Find the heat of fusion for this material.
Heat Of Fusion Formula FAQs
What is the heat of fusion?
The heat of fusion, also known as the enthalpy of fusion, is the amount of heat energy required to change a substance from a solid to a liquid state at its melting point.
How is the heat of fusion measured?
The heat of fusion is measured in joules per gram (J/g) or calories per gram (cal/g) and represents the energy required to melt one gram of a substance.
Does the heat of fusion vary for different substances?
Yes, the heat of fusion varies from one substance to another. Each material has its specific heat of fusion, which is unique to its chemical composition.
Why is the heat of fusion important?
The heat of fusion is important in various scientific and industrial applications, such as in the design of refrigeration systems, understanding phase changes, and in the food industry for freezing and thawing processes.
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