Gibbs Free ENergy.docx - Entropy Gibbs Free Energy and Reaction Quotient Submitted By Christina McCool Partner Chloe Devanny Date of Submission Lab

# Gibbs Free ENergy.docx - Entropy Gibbs Free Energy and...

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Entropy, Gibbs Free Energy, and Reaction Quotient Submitted By: Christina McCool Partner: Chloe Devanny Date of Submission: April 19, 2018 Lab Section 21

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Purpose The purpose of this experiment is to determine the minimum change in entropy for the dissolution of sodium nitrate in water, and to determine the Gibbs free energy change and reaction quotient for the dissolution of calcium chloride in water. Procedure The procedure for this lab can be found on pages 62- 67 in General Chemistry CHE111L Lab Manual Spring 2018 . Data Tables Carbon copies of data tables have been attached to the end of this lab report. Calculations 1. T Tf- Ti = T Trial 1 Trial 2 18.5 – 21.9= -3.4 C 18.6 – 22.1= -3.5 C 2. q Solution (mass of solution) x ( T solution) x (SH Solution)= q solution Trial 1 Trial 2 (26.092) x (-3.4) x (4.184) = -371.1744 j (26.211) x (-3.5) x (4.184) = -383.8339 j 3. q dissolution q dissolution = - q solution Trial 1 Trial 2 371.1774 j 383.8339 j 4. # moles solute (Mass of NaN O 3 g ¿ (1mole/ molar mass g)= # moles solute Trial 1 Trial 2 (2.042 g) x (1mole/ 84.9947g) = 0.024 moles (1.946g) x (1mole/ 84.9947g)= 0.0229 moles 5. H
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