- #1
RUSI16
- 1
- 0
is enthalpy change during isothermal process zero? if it is zero then what is the significance of enthalpies like enthalpy of vapourization or fussion since during phase transformation temperature remains constant.
H = U +PV so dH =dU + PdV + VdP. For an ideal gas, dU =0 for an isothermal process, so dH = PdV +VdP.RUSI16 said:is enthalpy change during isothermal process zero? if it is zero then what is the significance of enthalpies like enthalpy of vapourization or fussion since during phase transformation temperature remains constant.
You answered your own question. Enthalpy is not just a function of temperature. It is also a function of pressure, state of aggregation, and chemical composition.RUSI16 said:is enthalpy change during isothermal process zero? if it is zero then what is the significance of enthalpies like enthalpy of vapourization or fussion since during phase transformation temperature remains constant.
Enthalpy change during an isothermal process refers to the amount of heat energy absorbed or released by a substance while its temperature remains constant. This means that there is no change in the internal energy of the substance, and the energy is solely used to perform work.
The enthalpy change during an isothermal process is considered to be zero because the temperature of the substance remains constant. This means that there is no change in the internal energy of the substance, and all the energy is used to perform work instead of increasing the temperature.
No, enthalpy change during an isothermal process is not always zero. It is only zero when the temperature of the substance remains constant. If there is a change in temperature, then the enthalpy change will not be zero.
Enthalpy change is directly related to heat transfer during an isothermal process. This is because the enthalpy change represents the amount of heat energy absorbed or released by the substance during the process. The higher the enthalpy change, the more heat is transferred.
Yes, enthalpy change during an isothermal process can be negative. This occurs when the substance releases heat energy during the process. In this case, the enthalpy change will have a negative value, indicating an exothermic reaction.