Editing Temperature Of Phase Change Calculation
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One way of determining if a process/reaction is <b>spontaneous</b> in the direction we wrote/want, is to determine the entropy change of the universe, ΔS<sub>univ</sub>. <br> The equation is <center>Δ<sub>univ</sub> = ΔS<sup>o</sup><sub>sys</sub> + {(-ΔH<sup>o</sup><sub>sys</sub>)/T<sub>sys</sub>)}</center> <br> So you can start picking different temperatures (T<sub>sys</sub>) and calculating what the ΔS<sub>univ</sub> will be for that temperature. If you do this several time and pick the correct temperatures, you can see where the ΔS<sub>univ</sub> does from positive to negative or visa versa. Whichever way, it is when<br><br> ΔS<sub>univ</sub>=0 is where the system is at Equilibrium <br><br> This physically means that the system is going through a phase change and that system temperature is <b>Temperature of Phase Change</b>. For example, the boiling (condensation)point, melting freezing)point, etc. <br><br> <center><b>Example : H<sub>2</sub>O<sub>(l)</sub>==> H<sub>2</sub>O<sub>(g)</sub></b></center><br><br>
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