28th November 2019

wikipedia

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What is the heat of vaporization of water?

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On the other hand, the molecules in liquid water are held together by relatively strong hydrogen bonds, and its enthalpy of vaporization, 40.65 kJ/mol, is more than five times the energy required to heat the same quantity of water from 0 °C to 100 °C (c_p = 75.3 J K⁻¹ mol⁻¹).

What is the definition of latent heat of vaporization?

Latent heat is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process. Two common forms of latent heat are latent heat of fusion (melting) and latent heat of vaporization (boiling). In both cases the change is endothermic, meaning that the system absorbs energy.

What is meant by the latent heat of vaporization?

Whether, a substance is converting from solid to liquid or liquid to gas, we use this term latent heat. So lets come to latent heat of vaporization. So, the amount of heat required to convert a substance from liquid to vapor at a given saturation temperature and pressure is called latent heat of vaporization.

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What is the C of water?

The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation.

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What is the molar heat of vaporization of water?

It is only for one mole of substance boiling. The molar heat of vaporization is an important part of energy calculations since it tells you how much energy is needed to boil each mole of substance on hand. The units for the molar heat of vaporization are kilojoules per mole (kJ/mol).

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What is the definition of the heat of vaporization of water?

The energy or heat consumed per unit mass during the vaporization of a liquid is called heat of vaporization or enthalpy of vaporization. To condense water vapor to its liquid phase, energy must be removed from the gas. The energy per unit mass required to condense water vapor is equal to the heat of vaporization.

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Can heat of vaporization be positive or negative?

The enthalpy of condensation (or heat of condensation) is numerically exactly equal to the enthalpy of vaporization, but has the opposite sign: enthalpy changes of vaporization are always positive (heat is absorbed by the substance), whereas enthalpy changes of condensation are always negative (heat is released by the

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Why is water such a good solvent?

Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. This is important to every living thing on earth.

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What is the heat of fusion of water?

The enthalpy of fusion of a substance, also known as (latent) heat of fusion, is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.

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What is the value of the latent heat of vaporization of water?

1 calorie = 4.186 J. Latent heat of vaporization of water = 539 cal/g = 2256 kJ/kg. Latent heat of fusion of water = 79.5 cal/g = 333 kJ/kg. Specific heat of water = 1 cal/g = 4.19 kJ/kg.

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What is responsible for the surface tension of water?

The property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules. The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension.

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What is the latent heat of vaporization of water?

It is defined as the heat required to change one mole of liquid at its boiling point under standard atmospheric pressure. When a material in liquid state is given energy, it changes its phase from liquid to vapor; the energy absorbed in this process is called heat of vaporization (or evaporation).

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Why does water expand when it freezes?

The orderly, crystalline way in which the hydrogen-bonds form causes density to decrease because each water molecule is held away from its neighbors at a distance equal to the length of the hydrogen bonds. Thus water expands as it freezes, and ice floats atop water.

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Is ice more or less dense than water?

When water freezes, its molecules lose energy and get stuck in a lattice structure in which they are farther apart from each other than in their liquid state, thus making ice less dense than water.

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What happens to the surface when the water evaporates?

Evaporation happens when a liquid substance becomes a gas. When water is heated, it evaporates. The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor. Evaporation is a very important part of the water cycle.

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What is the latent heat of vaporization of steam?

The specific latent heat of vaporization is the amount of heat required to convert unit mass of a liquid into the vapour without a change in temperature. For water at its normal boiling point of 100 ?C, the latent specific latent heat of vaporization is 2260 kJ.kg^-¹.

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Why is the heat of vaporization of water high?

The energy required to break multiple hydrogen bonds causes water to have a high heat of vaporization. A large amount of energy is needed to convert liquid water, where the molecules are attracted through their hydrogen bonds, to water vapor, where they are not.

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What is the heat of vaporization of water in calories per gram?

Similarly, while ice melts, it remains at 0 °C (32 °F), and the liquid water that is formed with the latent heat of fusion is also at 0 °C. The heat of fusion for water at 0 °C is approximately 334 joules (79.7 calories) per gram, and the heat of vaporization at 100 °C is about 2,230 joules (533 calories) per gram.

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What is the definition of latent heat of vaporization?

heat of vaporization. the heat absorbed per unit mass of a given material at its boiling point that completely converts the material to a gas at the same temperature: equal to the heat of condensation.

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What is the heat of sublimation?

The enthalpy of sublimation, or heat of sublimation, is the heat required to change one mole of a substance from solid state to gaseous state at a given combination of temperature and pressure, usually standard temperature and pressure (STP).

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What is the density of water in lbs ft3?

Density.
8.34540445202 lbs per gallon.
0.036 lbs per cubic inch.
1 gram per cubic centimeter (cc) at 39.2°F.

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Is Melting Fusion?

Melting, or fusion, is a physical process that results in the phase transition of a substance from a solid to a liquid. This occurs when the internal energy of the solid increases, typically by the application of heat or pressure, which increases the substance's temperature to the melting point.

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