# 5. Judy's data plot has a lesser slope than Nancy's. Which student will have the morepositive AH° for the dissolution of borax? Explain. Hint: for interpretation, rememberthat a slope of -100 is less than a slope of -150.

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16 views help_outlineImage Transcriptionclose5. Judy's data plot has a lesser slope than Nancy's. Which student will have the more positive AH° for the dissolution of borax? Explain. Hint: for interpretation, remember that a slope of -100 is less than a slope of -150. fullscreen
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Step 1

The equation for Gibbs free energy is written in equation (1).

The Gibbs free energy in equilibria is written in equation (2).

Combine equations (1) and (2), as shown in equation (3). This equation is in the form of straight line represented by y = mx + b. help_outlineImage TranscriptioncloseΔGΔΗ -TAS (1) ΔG-RT In K, (2) eg ΔΗ ΔS. In K (3) RT R Θ fullscreen
Step 2

The straight line with a slope equal to -∆H/R is formed in t... help_outlineImage TranscriptioncloseΔΗ. slope = R AH ΔΗ' slope = 8.314 J/mol.K AH° =-slope× 8.314 J/mol.K fullscreen

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### Chemical Thermodynamics 