What is the formula for calculating latent heat?
Latent heat calculation The specific latent heat is different for solid to liquid transition and liquid to gas transition. For example, if we want to turn 20 g of ice into water we need Q = 20 g * 334 kJ/kg = 6680 J of energy. To turn the same amount of water into vapor we need Q = 45294 J .
What do you understand by specific latent heat of fusion?
The specific heat of fusion of a substance is the quantity of heat required to convert a unit mass of the substance from solid to liquid state at its melting point. C.
How does latent heat show up on a phase diagram?
Latent heat is changing phase, and when a change in phase is accomplished at constant pressure temperature is constant. On the phase diagram, latent heat shows up as a “thermal plateau” where the graph is a flat line for a brief portion.
What is the latent heat of steam at atmospheric pressure?
As the latent heat of steam at atmospheric pressure is 2257 kJ/kg the amount of flash steam produced will be 299/2257 = 0.133 kg/kg of condensate.
What is the effect of Vapour pressure on heat?
The vapor pressure of a liquid varies with its temperature, as the following graph shows for water. The line on the graph shows the boiling temperature for water. As the temperature of a liquid or solid increases its vapor pressure also increases. Conversely, vapor pressure decreases as the temperature decreases.
Does boiling point increase with temperature?
The lower the pressure of a gas above a liquid, the lower the temperature at which the liquid will boil. As a liquid is heated, its vapor pressure increases until the vapor pressure equals the pressure of the gas above it. The temperature of a boiling liquid remains constant, even when more heat is added.
What is vapor pressure and why does it change with temperature?
As the temperature of a liquid increases, the kinetic energy of its molecules also increases and as the kinetic energy of the molecules increases, the number of molecules transitioning into a vapor also increases, thereby increasing the vapor pressure.
Which of the following is having higher Vapour pressure at same temperature?
Answer: Vapour pressure is related with the molecular weight, lower the molecular weight higher the vapour pressure. since CH3OH has less molecular weight as compare to C2H5OH thus CH3OH has higher vapour pressure than C2H5OH at the same temperature.
Which has maximum Vapour pressure?
At the normal boiling point of a liquid, the vapor pressure is equal to the standard atmospheric pressure defined as 1 atmosphere, 760 Torr, 101.325 kPa, or 14.69595 psi. For example, at any given temperature, methyl chloride has the highest vapor pressure of any of the liquids in the chart.
Which has maximum Vapour pressure HF HCl HBr?
> If we talk about the HF, it has strong hydrogen bonding, thus has the highest boiling point. > Therefore, HF exists in the liquid state, and HI, HBr, and HCl exists in the gaseous state.