Verified answer

Use good old PV=nRT , convert torr => atm, 250/760 = P = 0.33 atm, isolate V,

V=(nRT)/P, V=(2.5*0.08206*296.15)/0.33) = 184 Litres

Ideal Gas Law

-change Torr into atm (preferred) or mmHg

-change 23.0 Celsius to Kelvin

-rearrange Ideal Gas Law (PV = nRT) to solve for V.

V = nRT/ P

-obtain R-value in whatever form you chose (atm is preferred)

-substitute all values and solve for V