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Calculate the standard entropy change for the formation of 1.0 mol of the following compounds...

Question:

Calculate the standard entropy change for the formation of 1.0 mole of the following compounds from the elements at 25°C.

  • a) {eq}H_2S (g){/eq}
  • b) {eq}MgCO_3 (s){/eq}

A Universe of Disorder:

One of the thermodynamic parameters with which scientists work is entropy. Entropy (S) is a measure of disorder of a system, its surroundings, and the universe which is always increasing in disorder overall. Everything has entropy to some extent even elements in their natural states although they have zero free energy and enthalpy in those elemental states. We can calculate the change in entropy of reaction for the formation of a compound using the entropy of its elements in their standard elemental states and that of the final compound. In equation form, it looks like this:

{eq}\Delta S^o_{reaction}\:=\:\sum nS^o(products)\:-\:\sum mS^o(reactants) {/eq}

where m and n represent the respective stoichiometric coefficients of the compounds in the balanced chemical reaction equation.

Answer and Explanation: 1

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ANSWERS:

a) The ΔS° for the formation of hydrogen sulfide is 42.8 J/K.

b) The ΔS° for the formation of magnesium carbonate is...

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Entropy in Chemistry | Definition & Calculation

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Chapter 14 / Lesson 12
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Understand what entropy is in chemistry by learning the entropy definition. Discover what S means in chemistry. Learn the meaning of positional entropy.


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