Mass of liquid water (g)___________show calculation: 7. Mass of condensed steam (g)___________show calculation: 8. Change in T of liquid water (T liquid, °C)___________show calculation:
Latent heat and phase change
A physical process in which a conversion among the basic states or phases of matter, i.e., solid, liquid, and gas takes place under the effect of a certain temperature and pressure is referred to as a phase change. Generally, the phase change of a substance occurs when heat transfer takes place between the substance and its surroundings. Based on the direction in which heat transfer takes place, different types of phase changes can occur.
Triple Point of Water
The branch of physics in which observer deals with temperature related properties is called thermodynamics.
Boiling Point of Water
Everyday examples of boiling is, boiling milk, heating water. One would have observed that when we heat water it goes through various stages and at one point bubbles show in water, and water keeps splashing with bubbles bursting, we in layman terms say that water is boiling.
Freezing Point of Water
In general, the freezing point of water is 0° Celsius, or 32° Fahrenheit. This is the temperature at which water will ordinarily change from its liquid state to its solid state (ice). However, there are certain conditions that can affect the freezing point of water. For example, a liquid may be supercooled or contain impurities so that it does not freeze at the ordinary freezing point.
Part II: Determination ofHvap(Accepted value is 40.7 kJ/mol)
1. Mass of calorimeter and cover (g)16.3126
2. Mass of calorimeter, cover, and liquid water (g)119.4516
3. Initial temperature of liquid water, (Tiliquid, °C)23.5
4. Final temperature of mixture (Tfall, °C)56.9
5. Mass of calorimeter, cover, warm water,127.0340and condensed steam (g)
6. Mass of liquid water (g)___________show calculation:
7. Mass of condensed steam (g)___________show calculation:
8. Change in T of liquid water (T liquid, °C)___________show calculation:
9. Change in T of condensed steam (T ice, °C)
10. Heat absorbed by liquid water (qliquid, J)
11. Heat lost by cooling condensed steam (qcool, J)
12. Heat lost by condensing steam (qcondense, J)
13. Mols of condensed steam (mols)
14. Heat of condensation ( ΔHcondense, kJ/mol)
15. Percent error of ΔHvap (%)
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