When does the boiling point of a liquid occur?
when the vapor pressure of the liquid equals the atmospheric pressure
only when a liquid is very hot
when the line leans towards the less dense
when the vapor pressure of the liquid equals the vapor pressure of the solid
when the vapor pressure of the liquid equals the atmospheric pressure
What is the boiling point of CHCl3if the atmospheric pressure on the surface of the liquid is 50 kPa?
The boiling point of CHCl3 at atmospheric pressure of 50 kPa is approximately 49.6°C (121.3°F).
64°C
78°C
100°C
101.3°C
The boiling point of CHCl3 at atmospheric pressure of 50 kPa is approximately 49.6°C (121.3°F). None of the given options is correct.
The boiling point of a liquid occurs when the vapor pressure of the liquid equals the atmospheric pressure. This is the temperature at which a liquid changes into a gas, forming bubbles throughout the liquid.
The boiling point of a liquid occurs when the vapor pressure of the liquid equals the atmospheric pressure. To understand why, we need to know that boiling is the process in which a liquid turns into vapor (gas) throughout the substance, not just at the surface. This happens when the molecules within the liquid have enough energy to overcome the intermolecular forces holding them together and escape into the gas phase.
The atmospheric pressure exerted by the surrounding air acts on the surface of the liquid. At any given temperature, the molecules within the liquid have a range of kinetic energies. Some molecules will have enough energy to escape as gas particles, creating vapor and contributing to the vapor pressure of the liquid.
When the temperature of the liquid increases, the average kinetic energy of the molecules also increases. This leads to an increase in the vapor pressure of the liquid. As the vapor pressure increases, it eventually reaches a point where it is equal to the atmospheric pressure. At this point, the rate of vaporization of the liquid becomes equal to the rate of condensation (conversion of gas to liquid) of the vapor. Since the vaporization and condensation rates are in equilibrium, the liquid is said to be boiling.
Therefore, the boiling point of a liquid occurs when the vapor pressure of the liquid equals the atmospheric pressure.