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The molar enthalpy of vaporization of benzene at its boiling point 353.25 K is 30.8 kJ mol-1 What is the molar internal energy change?
The molar internal energy change can be calculated using the equation: ΔU = ΔH - PΔV, where PΔV is the work done during the phase change. For vaporization, at constant pressure, the work done is approximately zero, so the molar internal energy change is approximately equal to the molar enthalpy of vaporization. Therefore, the molar internal energy change in this case is 30.8 kJ mol-1.
What is the total amount of energy a substance contains?
The total amount of energy a substance contains can be quantified by its internal energy, which includes both the kinetic energy of its molecules (related to temperature) and potential energy from intermolecular forces. This total energy is influenced by factors such as temperature, pressure, and chemical composition.
What happens to the internal energy of a gas when it expands?
When a gas expands, its internal energy typically increases. This is because the gas is doing work on its surroundings as it expands, which results in an increase in its internal energy.
What is the difference between enthalpy and internal energy in thermodynamics?
Enthalpy is the total heat content of a system at constant pressure, including internal energy and the energy required to displace the surroundings. Internal energy is the total energy stored within a system, including kinetic and potential energy of its particles.
Does Increasing the pressure of a liquid lower its boiling point?
No, increasing the pressure of a liquid actually raises its boiling point. This is because higher pressure increases the kinetic energy required for molecules to escape the liquid phase and enter the gas phase, which raises the temperature needed for boiling to occur.
Which do you think contains more internal energya teaspoon of boiling water or a pan full of water at 50c?
A pan full of water at 50°C contains more internal energy than a teaspoon of boiling water because internal energy is related to both temperature and mass. The pan has more water (greater mass) at a lower temperature compared to the boiling water, so it would have more total internal energy.
What contains more heat energy?
A cup of boiling water contains more heat energy than a cup of lukewarm water because the boiling water is at a significantly higher temperature. Heat energy is directly related to the temperature of an object.
Why is it true that a cup of boiling water contains less heat than a large iceberg?
While the boiling water is at a higher temperature, the iceberg contains significantly more thermal energy due to its larger mass. The iceberg has stored more heat energy to maintain its frozen state, whereas the boiling water is closer to its boiling point but has less overall energy.
What has more thermal energy a cup of boiling water or a pot of boiling water?
A pot of boiling water has more thermal energy than a cup of boiling water because it contains a greater volume of water and therefore a higher total amount of heat energy.
Which contains more heat thermal energy an iceberg or a port of boiling water?
A pot of boiling water contains more heat energy than an iceberg because the water in the pot is at a higher temperature than the ice in the iceberg. Heat energy is directly related to temperature, so the higher the temperature, the more heat energy an object contains.
Which contains the most thermal energy - a boiling pot of water or a frozen lake?
Frozen Lake
The molar enthalpy of vaporization of benzene at its boiling point 353.25 K is 30.8 kJ mol-1 What is the molar internal energy change?
The molar internal energy change can be calculated using the equation: ΔU = ΔH - PΔV, where PΔV is the work done during the phase change. For vaporization, at constant pressure, the work done is approximately zero, so the molar internal energy change is approximately equal to the molar enthalpy of vaporization. Therefore, the molar internal energy change in this case is 30.8 kJ mol-1.
What is the total amount of energy a substance contains?
The total amount of energy a substance contains can be quantified by its internal energy, which includes both the kinetic energy of its molecules (related to temperature) and potential energy from intermolecular forces. This total energy is influenced by factors such as temperature, pressure, and chemical composition.
Where is the heat energy going when a substance is boiling?
The energy is used to maintain the temperature at the boiling point.
Where all the heat energy is going when a substance is boiling?
The energy is used to maintain the temperature at the boiling point.
What is Smoke is an example of an?
Smoke is an example of mechanical energy and heat energy. This is because the internal motion of atoms is called heat energy and mechanical energy is energy associated with motion. Smoke contains atoms moving which is both an example of heat and mechanical energy.
Does thermal energy affect mass?
No, thermal energy does not affect mass. Mass is a measure of the amount of matter an object contains, while thermal energy is a measure of the internal energy of an object due to the movement of its particles.
