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Understanding Entropy: A Quantitative Measure of System Disorder

This chapter delves into the concept of entropy as a quantitative measure of disorder in thermodynamic systems. Entropy is denoted by the symbol S and measured in J/K·mol, with standard entropy values (S0) referenced at 25°C and 101.3 kPa. The change in standard entropy (∆S0) is calculated using the formula ∆S0 = ∑S0(products) - ∑S0(reactants). The chapter emphasizes the importance of balancing equations, as the coefficients from balanced equations are integral to the calculation of standard entropy. Refer to chart on page 558 for additional insights.

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Understanding Entropy: A Quantitative Measure of System Disorder

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  1. Chapter 19 Section 4 Entropy -a quantitative measure of the disorder of a system Entropy= S units= J/Kmol

  2. Standard entropy = S0 *this is at 25°C and 101.3kPa ∆ S0 = ∑S0(products) - ∑S0(reactants) (-) = decrease in entropy (+) = increase in entropy **equations must be balanced **coefficient from balanced equation goes in front of S0 -chart page 558

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