In the development of the Claudius Chaperon equation, what was the principal ass
ID: 490666 • Letter: I
Question
In the development of the Claudius Chaperon equation, what was the principal assumption? 2. Consider the vaporization process you will be modeling in this lab: BR at Be AH & Asp. Predict whether the process will be endothermic or exothermic, predict whether the system entropy would increase or decrease. Enthalpy of vaporization (Awe): expected sign Entropy of vaporization (AS e): expected sage If the assumption in question MI is correct, and the signs for AH. w & AS follow your prediction in question U2, what would you expect the experimental data to look like if you plotted In(vapor pressure of B)/(absolute temperature as predicted by the linear zed form of the Claudius- Chaperon equation (Be 6)? in water and heated in the experiment. But before you 4. A glass Erlenmeyer flask is introducing liquid into the flask there is some air already present. Imagine you stopper the air-filled flask, then heated the gaseous contents by warming the water surmounting the flask. Premiership you think would happen to the air pressure in the flask as the temperature rises. The ideal gas law is shown below, with subscript A" for air. In the scenario described above, circle the variables in the ideal gas law that would be constant. 5. In the actual lab, you will introduce liquid B into the stopper Erlenmeyer flask, and mixture of air and vaporized liquid will be present. Which do you predict will change more with vapor pressure of B (Pa)? partial pressure of air (PA What is your rationale? Watt Chemical DepartmentExplanation / Answer
the govering equation for deriving classius clayperon equation
is dP/dT= deltaH/ (Vg-Vl)
Vg= volume of gas and Vl= volume of liquid, deltaH= latent heat of vaporization
The assumptions made for deriving the equation are
1. Gas phase behaves like an ideal gas
2. Liquid volume is less compared to gas volume
3. The enthalpy is indepedent of temperature
the equation for vapor pressure is lnP= -deltaH/RT +C
since heat has to be supplied for evaporation, the proces is endothermic.deltaH is +ve. since entropy is degree of disorder and entropy increases during vaporization.
the plot of lnP vs 1/T will be straight line with -ve slope -deltaH/R
4. when air along with the liquid is heated, as the temperature is increased, the evaporated liquid mixes with air and it rises the pressure of the system and the pressure increases. the partial pressure of vapor in the gas phase increases.
5. as temperature is increased vapor pressure also increases which leads to more vaporization and it also increases the partial pressure of vaporized liquid in the gas phase.