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Molar heat refers to the amount of heat required to raise the temperature of one mole of a substance by one degree Celsius. It is a measure of the heat capacity of a substance on a per mole basis. Molar heat is often used in thermochemistry to calculate heat changes in chemical reactions.
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The molar heats of sublimation and fusion of iodine are 62.3kjmol and 15.3kjmol respectively calculate the molar heat of vaporization of liquid iodide?
The molar heat of vaporization of iodine can be calculated using Hess's Law. The molar heat of sublimation is the sum of the molar heat of fusion and the molar heat of vaporization, so: 62.3 kJ/mol = 15.3 kJ/mol + x kJ/mol. Solving for x, the molar heat of vaporization is 47.0 kJ/mol.
What is the difference between heat of reaction and molar heat of reaction?
The heat of reaction is the total amount of heat released or absorbed during a chemical reaction, while the molar heat of reaction is the heat of reaction per mole of a substance involved in the reaction. The molar heat of reaction allows for comparison of the energy changes between different reactions on a per mole basis.
Molar heat capacity of water?
The molar heat capacity of water is 75.3 J/mol K at constant pressure. This means that it takes 75.3 joules of energy to raise the temperature of one mole of water by 1 Kelvin.
When 1 gram of zinc chloride ZnCl2 is dissolved in water the heat evolved is 0.53kJ Calculate the molar heat of substance of solution of zinc chloride?
To calculate the molar heat of solution of zinc chloride, we use the heat evolved by dissolving 1 gram of ZnCl2 in water. First, we convert the mass of ZnCl2 to moles using its molar mass of 136.3 g/mol. Then, we divide the heat evolved by the number of moles dissolved to get the molar heat of solution. In this case, the molar heat of solution would be 3.89 kJ/mol.
Is molar heat capacity intensive or extensive?
Molar heat capacity is an extensive property because it depends on the amount of substance being considered.
The molar heats of sublimation and fusion of iodine are 62.3kjmol and 15.3kjmol respectively calculate the molar heat of vaporization of liquid iodide?
The molar heat of vaporization of iodine can be calculated using Hess's Law. The molar heat of sublimation is the sum of the molar heat of fusion and the molar heat of vaporization, so: 62.3 kJ/mol = 15.3 kJ/mol + x kJ/mol. Solving for x, the molar heat of vaporization is 47.0 kJ/mol.
What is the experimental molar heat of combustion?
The experimental molar heat of combustion is the heat released by the total combustion of a substance, determined in a calorimeter.
What is the difference between heat of reaction and molar heat of reaction?
The heat of reaction is the total amount of heat released or absorbed during a chemical reaction, while the molar heat of reaction is the heat of reaction per mole of a substance involved in the reaction. The molar heat of reaction allows for comparison of the energy changes between different reactions on a per mole basis.
The amount of heat necessary to change 1 kg of a solid into a liquid at the same temperature is called the?
molar heat of fusion
What is the relation of the molar heat of fusion to the molar heat of vaporization?
Molar heat of fusion: the heat (enthalpy, energy) needed to transform a solid in liquid (expressed in kJ/mol). Molar heat of vaporization: the heat (enthalpy, energy) needed to transform a liquid in gas (expressed in kJ/mol).
How do you figure out molar heat of combustion of phenol at 25 degrees celsius?
The molar heat of combustion of phenol can be calculated by measuring the heat released when a known amount of phenol is completely burned in a calorimeter. The heat released is then used to calculate the molar heat of combustion using the mass of phenol burned and the molar quantity of phenol. This calculation can be done using the formula: heat released = molar heat of combustion x moles of phenol.
Molar heat capacity of water?
The molar heat capacity of water is 75.3 J/mol K at constant pressure. This means that it takes 75.3 joules of energy to raise the temperature of one mole of water by 1 Kelvin.
When 1 gram of zinc chloride ZnCl2 is dissolved in water the heat evolved is 0.53kJ Calculate the molar heat of substance of solution of zinc chloride?
To calculate the molar heat of solution of zinc chloride, we use the heat evolved by dissolving 1 gram of ZnCl2 in water. First, we convert the mass of ZnCl2 to moles using its molar mass of 136.3 g/mol. Then, we divide the heat evolved by the number of moles dissolved to get the molar heat of solution. In this case, the molar heat of solution would be 3.89 kJ/mol.
Is molar heat capacity intensive or extensive?
Molar heat capacity is an extensive property because it depends on the amount of substance being considered.
How do you measure molar heat capacity?
Specific heat is the heat capacity divided by the heat capacity of water, which makes it dimensionless. To obtain molar heat capacity from specific heat for a material of interest, simply multiply the specific heat by the heat capacity of water per gram [1 cal/(g*C)]and multiply by the molecular weight of the substance of interest. For example, to obtain the molar heat capacity of iron Specific heat of iron = 0.15 (note there are no units) Molar heat capacity of iron = 0.15*1 cal/(g*C)*55.85 g /gmole = 8.378 cal/(gmole*C)
Estimate the molar heat of vaporization of a liquid whose vapor pressure doubles when the temperature is raised from 85 C to 95 C?
The molar heat of vaporization can be estimated by using the Clausius-Clapeyron equation, which relates the vapor pressure of a substance to its temperature and molar heat of vaporization. By knowing the temperature change and the corresponding increase in vapor pressure, calculations can be made to determine the molar heat of vaporization.
Why you prefer molar specific heat as compared to the simple specific heat?
In chemistry instead mass in kg it would be nice to deal the quantity in moles. Hence molar specific heat is best fit.
