Calculating Enthalpy Change of Ice Melting in Water

In summary, the total enthalpy change for a piece of ice melting in water and reaching equilibrium can be calculated by considering the heat absorbed for the ice to reach 0 degrees, the heat absorbed for the ice to melt to water, and the heat absorbed for the melted ice water to come to equilibrium with the water. This total enthalpy change is equal to the heat lost by the water surroundings and can be represented by the equation: mice× Cice× (Tfinal - Tice) + miceΔHfus°+ mice× cwater× (Tfinal - Twater) = mcal × Cwater× (Tcal - Tfinal). However, the equation needs to be modified to account for the correct
  • #1
shredder666
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If I have a piece of ice melting in a water and eventually comes to equilibrium with the water... The the total enthalpy change includes the following right?

Heat absorbed for ice to get to 0 degrees
Heat absorbed for ice to melt to water
Heat absorbed for the melted ice water to come to equilibrium with the water

And the above is equal to the heat lost by the water surroundings... right?

For people that likes math :P
The total enthalpy change can be represented by the following right?

mice× Cice× ΔTice + niceΔHfus°+ mice× cwater× ΔTwater = mcal × Cwater× ΔTcal
 
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  • #2
shredder666 said:
And the above is equal to the heat lost by the water surroundings... right?
Right.
shredder666 said:
The total enthalpy change can be represented by the following right?

mice× Cice× ΔTice + niceΔHfus°+ mice× cwater× ΔTwater = mcal × Cwater× ΔTcal
Not quite. In the second term on the left side, "nice" should be "mice". Also, you need to write the temperature changes explicitly as differences between two terms. As it stands, the equation cannot be solved for the final temperature of the water, but the idea behind it is correct.
 

Related to Calculating Enthalpy Change of Ice Melting in Water

1. What is enthalpy change?

Enthalpy change is the measure of energy transfer that occurs during a chemical or physical process. It is also known as heat change.

2. How is enthalpy change calculated?

The enthalpy change of a reaction can be calculated by subtracting the enthalpy of the reactants from the enthalpy of the products. In the case of ice melting in water, the enthalpy change can be calculated by subtracting the enthalpy of the ice from the enthalpy of the resulting liquid water.

3. What factors affect the enthalpy change of ice melting in water?

The enthalpy change of ice melting in water is affected by the initial temperature of the ice and water, the mass of the ice, and the heat capacity of water.

4. Can the enthalpy change of ice melting in water be negative?

Yes, the enthalpy change of ice melting in water can be negative. This occurs when the resulting liquid water has a lower enthalpy than the initial ice.

5. How is the enthalpy change of ice melting in water used in practical applications?

The enthalpy change of ice melting in water is used in refrigeration and air conditioning systems, as well as in industrial processes that require precise temperature control. It is also used in the development of new materials and in research on energy efficiency.

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