the Dulong and Petit law empirical relationship for the product of atomic mass a
ID: 967808 • Letter: T
Question
the Dulong and Petit law empirical relationship for the product of atomic mass and specific heat, (Mm)(Cp) = 25. indicates that the specific heat is inversely proportional to the atomic mass or proportional to the number of moles of particles as with colligative properties. 1)Compared to metals, what two factors cause the specific heat of water to appear to be exceptionally high?. 2) Does this concept( Dulong and petit relationship & specific heat equation) work on other substances such as sodium chloride, potassium chloride, calcium chloride, carbon tetrachloride or methanol (CH3OH)?. explain your answer
Explanation / Answer
The specific heat of water to appear to be exceptionally high due to following reasons:
1.
The Dulong and Petit law empirical relationship for the product of atomic mass and specific heat, (Mm)(Cp) = 25, indicates that the specific heat is inversely proportional to the atomic mass or proportional to the number of moles of particles as with colligative properties. Water has molar mass 18.02 g/ mass which was not so high thus it has high specific energy.
2. Water has H- bonding, because when energy imparted to water it can be used in three different ways rather than raising the temperature. This means that water has an extensive matrix of many molecules attracted to each other.
When energy is imparted to water, the water molecule use thus energy in vibration, rotation and translation of the molecules.
Thus water takes a lot of energy to raise the temperature one degree or if has high specific heat.
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