Quick question. Latent heat problem.

In summary, latent heat refers to the energy required to change the phase of a substance without changing its temperature. This can cause problems if the proper amount of energy is not provided, which can be calculated using the formula Q = mL. There are two types of latent heat - latent heat of fusion and latent heat of vaporization - which are associated with melting and boiling respectively. To solve latent heat problems, the correct amount of energy must be supplied through methods such as heating, cooling, or using phase change materials.
  • #1
new324
30
0
Allright, I may sound stupid on this one.
How much heat (Q) is required to change 456 g of ice at -25(degrees celsius) into water at 25(degrees C). The Specific heat of ice is 2090 J/kg K, the specific heat of water is 4186 J/kg K. The latent heat of fusion of water is 33.5*10^4 J/kg.

Is this just going to be Qwater+Qice+Qlatent? Where Qlatent is m*L?
 
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  • #2
[tex]Q = cm\Delta T[/tex]

and

[tex]Q = mH_f[/tex]

I think you have the right idea, but your notation is a little awkward.

cookiemonster
 
  • #3
Thanks cookiemonster. I appreciate the help.
 

Related to Quick question. Latent heat problem.

1. What is latent heat?

Latent heat refers to the amount of energy required to change the phase of a substance without changing its temperature. This energy is used to break the bonds between molecules during a phase change.

2. What causes a latent heat problem?

A latent heat problem can occur when there is a change in phase of a substance, such as from a solid to a liquid or from a liquid to a gas. This change requires energy, which can lead to issues if the proper amount of energy is not provided.

3. How do you calculate latent heat?

The formula for calculating latent heat is Q = mL, where Q is the amount of heat energy required, m is the mass of the substance, and L is the specific latent heat for the particular substance. The specific latent heat can be found in reference tables for different materials.

4. What is the difference between latent heat of fusion and latent heat of vaporization?

Latent heat of fusion is the amount of energy required to change a substance from a solid to a liquid, while latent heat of vaporization is the amount of energy required to change a substance from a liquid to a gas. The former is associated with melting, while the latter is associated with boiling.

5. How can latent heat problems be solved?

In order to solve a latent heat problem, the proper amount of energy must be provided to facilitate the phase change. This can be done through methods such as heating or cooling the substance, or by using phase change materials that can absorb or release heat energy during a phase change.

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