Change in Entropy of an expanding gas

1. The problem statement, all variables and given/known data
Four moles of an ideal gas expands at constant temperature until its pressure is reduced to half of its initial value. What is the change in entropy of the gas?

2. Relevant equations
ΔS=Q/T (For constant T) pinitial=p pfinal=.5p
Q=W
W=pdv
nrTln(vf/vi)

3. The attempt at a solution
I tried using nrTln(vf-vi), but realized I cant do that not knowing the temperature or the volumes. Is there an equation using deltap that I could use to solve for this that I am unaware of or can’t figure out? Thanks

http://ift.tt/1eZGIju

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