Pieces of four different metals are present on a table. These metals are Na, AI, W and Ti. Their melting points are 98, 660, 3410 and 1660oC respectively. Metal having maximum enthalpy of fusion is
Correct answer: C. w
- A. Ti
- B. AI
- C. w
- D. Na
Explanation
The enthalpy of fusion (also known as heat of fusion) is the amount of heat required to change a substance from a solid to a liquid at its melting point while keeping its temperature constant. It is typically expressed in units of joules per mole (J/mol) or joules per gram (J/g).Given the melting points of the four metals:Na (Sodium): 98°CAl (Aluminum): 660°CW (Tungsten): 3410°CTi (Titanium): 1660°CTo determine which metal has the maximum enthalpy of fusion, we need to consider the relationship between melting point and enthalpy of fusion. Generally, metals with higher melting points tend to have higher enthalpies of fusion because they require more energy to transition from the solid phase to the liquid phase.Comparing the melting points:Na (98°C) < Al (660°C) < Ti (1660°C) < W (3410°C)Based on this comparison, we can infer that W (Tungsten), with the highest melting point of 3410°C, likely has the maximum enthalpy of fusion among the given metals because it requires the most energy to change from a solid to a liquid at its melting point.So, the correct answer is:c. W
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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