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Unformatted text preview: MAPUA I NST I TUTE OF TECHNOLOGY School of Chemical Engineering, Chemistry, Biological Engineering, and Material Science and Engineering Physical Chemistry Laboratory 2 - 3 rd Quarter SY 2010-2011 Neil Patrick P. Tangara , 3 rd Year B.S. Chemical Engineering Experiment No. 5 T HERMODYNAM ICS OF M IXTURES: DETER M I NAT ION OF PART IAL MO LAR ENT HALPY Meynard Austria 1 , Neil Patrick Tangara, Darlene Pudolin, Emily Rose Santos, Aeiocellis Tan, Creza Loraine Talingting 2 1 Professor; 2 Students, all from CHM171L/A31, School of Chemical Engineering, Chemistry, Biological Engineering & Material Science and Engineering, Mapua Institute of Technology ABSTRACT This experiment intends to utilize the PARR 1455 solution calorimeter to determine the partial molar enthalpy of ammonium chloride (a) and water (b) in a binary mixture. The partial molar enthalpy was determined by taking the partial derivative of the mole fraction versus molar enthalpy of solution profile with respect to the number of moles of the component of interest. It was found that the partial molar enthalpy of ammonium chloride increases as we increased its concentration in the mixture while water decreases its partial molar enthalpy as its concentration decreases. This report will discuss why such a phenomenon occurs. Keywords : partial molar enthalpy, binary mixture I N TRODUCT ION A partial molar property is a thermodynamic quantity which indicates how an extensive property of a solution or mixture varies with changes in the molar composition of the mixture at constant temperature and pressure , or for constant values of the natural variables of the extensive property considered. Essentially it is the partial considered....
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