A sample of gas occupying 350. ml at 25°C is cooled to -25°C. What volume will it occupy if the pressure remains constant?

Question

zale101 · Answer

PV=nRT
Based on your question what's changing? 
I only see temperature and volume, the rest is constant
So, eliminate moles, pressure, and since R is always constant we'll just remove it anyways. 
V=T  <--only left with this

$\Large \frac{V_1}{T_1}=\frac{V_2}{T_2}$
v1=$350. ml*\frac{1L}{1000ml}=.35~L$
t1=$ 25°C +273K=298~K$
v2= Unknown 
t2=$-25°C +273K=248~K$

$\Large \frac{.35~L}{298~K}=\frac{V_2}{248~K}$
Solve for v2