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physics_newbi
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The Specific Entropy of Water is 69.9J/K.
What about ice?
i did a search on the internet but couldn't find anything
Please help
What about ice?
i did a search on the internet but couldn't find anything
Please help
Mapes said:Hi physics_newbi, welcome to PF. The decrease in entropy when a liquid freezes is [itex]\frac{L}{T}[/itex], where L is the latent heat (J/kg) and T is the freezing temperature (K). This will help you approximate the entropy of ice near the freezing point.
Mapes said:1) Your latent heat is off by several orders of magnitude.
2) You need to subtract [itex]\frac{L}{T}[/itex] from the entropy of water at 0°C, which is actually 63.3 J/K-mol (you had the value at STP).
3) Some values are in kilograms and some are in moles, so you will want to convert everything to one or another.
Mapes said:Try to carry the units along with every number. If the units don't match up, then the calculation is invalid. The calculation
[tex]63.3\,\frac{\mathrm{J}}{\mathrm{K}\cdot \mathrm{mol}} - 1223\,\frac{\mathrm{J}}{\mathrm{K}\cdot \mathrm{kg}} = \dots[/tex]
cannot give any meaningful answer.
The number of grams in a mole of a substance is its molecular weight.
The specific entropy of ice is a thermodynamic property that measures the amount of heat required to transform a unit mass of ice at a given temperature and pressure into water at the same temperature and pressure.
The specific entropy of ice can be calculated using the following formula: S = Q/mT, where S is the specific entropy, Q is the heat transferred, m is the mass of the ice, and T is the temperature.
Specific entropy of ice is important because it helps to determine the amount of energy needed to melt ice and also plays a crucial role in various thermodynamic calculations and processes, such as refrigeration and phase transformations.
Compared to other substances, ice has a relatively low specific entropy. This means that it requires less energy to melt ice compared to other substances at the same temperature and pressure.
Yes, the specific entropy of ice can change depending on the temperature and pressure conditions. As the temperature and pressure increase, the specific entropy also increases, and vice versa.