Hello, Zoey,
I thought I had answered this already, but just in case . . .
Please follow the steps I outlined in other questions I answered for you.
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We can use a gas law relationship in a case where there is no gain or loss of the number of moles of the gas. It is:
P1V1/T1 = P2V2/T2
Where P, V, and T are pressure, volume and temperature (in Kelvin), respectively. The subscripts 1 and 2 mean initial and final.
Make a table with the values and rearrange the equation to solve for the unknown, In this case, the unknown is T2.
T2 = T1(V2/V1)(P2/P1)
Please note that I’ve rearranged the equation to demonstrate that the final temperature is a function of the ratios of initial and final pressure and volumes, to help visualize the conditions and predict outcomes.
Set up a table and enter the data. Pay attention to see if the units cancel to leave liters. Also be certain that temperatures are in Kelvin, which they are already, in this case.
I got a value of 387K for T2, but please check my calculations.
Bob