Chemistry Essay

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PHYSICAL CHEMISTRY LABORATORY SCES 2230 EXPERIMENT 7 TITLE : THERMODYNAMICAL PROPERTIES OF LIQUID-VAPOUR PHASE EQUILIBRIUM NAME : NUR NAJIHA BINTI MOHD SUPIAN MATRICS NUMBER : SEZ130030 NAME OF PARTNER : NOR HIDAYU BINTI AB AZID MATRICS NUMBER : SEZ130024 DATE OF EXPERIMENT : 24TH SEPTEMBER 2014 LECTURER : DR. NOOR IDAYU MAT ZAHID TUTOR : MISS FAUZANI MOHD SALLEH Title : Thermodynamical properties of liquid-vapour phase equilibrium Objective: To determine the enthalpy and entropy of vaporization of t-butyl alcohol. Introduction: The heat of vaporization, (Hv or Hvap) is the amount of thermal energy required to convert a quantity of liquid into a vapor. It can be thought of as the energy required to break the intermolecular bonds within the liquid. It is also often referred to as the latent heat of vaporization (LHv or Lv) and the enthalpy of vaporization (Hv or Hvap) and is usually measured and reported at the temperature corresponding to the normal boiling point of the liquid. Sometimes reported values have been corrected to a temperature of 298 K. Using the Clausius-Clapeyron equation: It can be applied to any equilibrium between two phases, such as the process of melting or evaporation. In the phase equilibrium between liquid and gas, the Clapeyron equation can be modified to a more useful form by making some appropriate assumptions. Log10P = - ∆ Hm + Integration constant 2.303RT The enthalpy of vaporization can be determined from the gradient of the plot of log p versus 1/T, and subsequently the entropy of vaporization can then be calculated by using equation ∆ Sm = ∆ Hm T Experimental procedure: 1. The apparatus was set as following. 2. The tab B was closed and tap A was opened connected to pump. 3. Tap A was closed when

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