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# Half-life and Periodic Trends

Because the time it takes for a reaction to actually reach equilibrium is infinite, scientists have used the estimate that after ten half-lives (or ten half-times) the reaction is completed (i.e., the reaction has reached equilibrium). Chlorine gas and solid sodium metal react to produce sodium chloride. If you place one mole of chlorine gas in an evacuated, 1-L container with a large excess of sodium and maintain the flask at 25 degrees celcius, the reaction follows first order kinetics. After 25 minutes , the pressure in the flask is found to be 5.3824 atm. Determine the total time it would take for the reaction to come to completion (i.e., reach ten half-times). R=0.0820578 L atm/Deg mol

A 0.1677m aqueous solution of acetic acidhas a freezing point of -0.3152. The calculated freezing point is actually -0.3119. Explain this difference

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#### Solution Summary

The solution gives 245 words of guidance on the steps to take to determine the time a given reaction will take to reach completion. Links for further clarification are included.

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