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Since it depends on vapor pressure, it varies depending on the temperature at which it's measured.
At its boiling point at 1 atm, Water requires 539.43 calories per gram, 40.65 kj/mol, or 2257 kj/kg.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoHydration enthalpy is the energy released when 1 mol of a substance is dissolved into a solution. It is always negative, as attraction bonds (e.g. dative, ion-dipole) are being formed.
Wiki User
∙ 16y agoEnthalpy is temperature dependant,
You will have to use a table such as the following,
http://www.thermexcel.com/english/tables/eau_atm.htm
Wiki User
∙ 10y ago104.86kJ/kg or 25.04kcal.kg if you take room temperature to be 25 degrees Celsius
Wiki User
∙ 11y ago143.6 btu/lb
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What happens to enthalpy when temperature is decreased?
the atoms (or molecules) within the substance move slower, as temperature decreases.
When you mixed room temperature salt and room temperature water the mixture changes temperature. If you leave this mixture undisturbed for several hours what would happen to the temperature?
The temperature of the water/salt solution will equalize to room temperature.
Why do the temperature of distilled water have to be the same as room temperature?
It doesn't
Why is the enthalpy of sublimation is equal to the sum of enthalpy of fusion and enthalpy of vaporization?
Enthalpy is a state function, and to a first approximation does not depend on temperature. So the change in enthalpy to go from solid to a gas directly (sublimation) at some temperature is equal to the sum of the enthalpies associated with going from a solid to a liquid (fusion) and going from a liquid to a gas (vaporization) at other temperatures.
Which matter remains liquid at room temperature?
Alcohol, water, oil, and mercury come to mind.
What is the relationship between enthalpy and temperature?
Enthalpy is the amount of energy in a system and when this changes (when a reaction happens), the energy is either released (exothermic) or absorbed (endothermic) and this energy is usually released or absorbed as heat. Therefore when the enthalpy decreases, heat is released from the system making it exothermic. In contrast, when the enthalpy increases, heat is absorbed making it endothermic.
Why doesn't the temperature of water continually increase as it heated?
Temperature doesn't give the whole picture when you talk about boiling. A more useful property to talk about is enthalpy. Enthalpy is the energy held by the water. Prior to the boiling point, enthalpy and temperature both rise linearly. At the boiling point, temperature stops rising, but enthalpy continues to rise until it becomes steam. If you were to continue adding energy to the steam, it's temperature would rise again. The amount of energy that must be added to water to get it from water just at the boiling point to steam is the latent heat of vaporization and is equal to the enthalpy rise discussed in the previous paragraph. The latent heat of vaporization and the temperature where boiling will occur are dependant on the pressure.
What happens to enthalpy when temperature is decreased?
the atoms (or molecules) within the substance move slower, as temperature decreases.
What is room temperature water?
Room temperature water is the same as room temperature which ranges from 14C-25C (59F-77F)
Why the reaction between hydrogen and chlorine is very slow at room temperature?
Because hydrogen molecule is very stable and it is because of high dissociation enthalpy of hydrogen molecule, it reacts slowly with chlorine at room temperature.
Does a red apple age faster in room temperature air or in a bowl of room temperature water?
Room temperature air. The water keeps it fresher.
Can you boil the water at room temperature?
yes,at room temperature by decreasing the pressure we can boil the water.
What is the temperature for flavor water?
Room temperature
Is being solid at room temperature a special property of water?
Water is not solid at room temperature, unless the room is also a freezer.
When you mixed room temperature salt and room temperature water the mixture changes temperature. If you leave this mixture undisturbed for several hours what would happen to the temperature?
The temperature of the water/salt solution will equalize to room temperature.
What temperature should the water be for water marble nails?
room temperature
Why does cold water revert to room temperature?
cold water absorbs heat from the surroundings and revert to room temperature
