Quick physical chemistry question

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The discussion focuses on calculating the final temperature of a 16.0g sample of carbon dioxide during a reversible adiabatic expansion from 500mL to 2.00L at an initial temperature of 298.15K. The formula used for the calculation is Tf = Ti (Vi/Vf)^(1/c). A key point of confusion was determining the value of c, which is related to the specific heat capacity at constant volume. Initially, the user struggled to calculate c, which is defined as Cv,m/R, and expected it to be 3.463. Ultimately, the user resolved the issue by finding the necessary information in the back of the book.
gman5
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Calculate the final temperature of a sample of carbon dioxide of mass 16.0g that is
expanded reversibly and adiabatically from 500mL at 298,15K to 2.00L.

I know the answer and understand how to do the problem except for 1 part.

The equation to get the solution is : Tf = Ti (Vi/Vf)^(1/c)

The part I cannot figure out is how to find c. I know c = Cv,m/R = 3.463, but when I try to calculate c I get something other than 3.463.
 
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nevermind, it turns out that some information needed to make the calculation is contained in the back of the book, so I figured it out.
 
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