Consider a high pressure gas cylinder of methane which exhibits a pressure of 200 atmosphers (absolute) at a temp. of 0*C in a small storage building. the building catches fire whcih causes the temp of the cylinder to rise to 1200*C. What would the pressure in the cylinder be then? express your answer in both atmopheres and in psi(lbf/in^2), assume methane behaves as an ideal gas. ok. seems easy. but im confused about this whole ideal gas thing. do i always use (0.08205 atmos. liters/ mole K) for R? if so then would i do... (P1)(V)=(R)(T1) = (200)(V)=(0.08205)(273) so, V = ((0.08205)(273))/(200) = 0.1119 but this number seems unlikley. but if so (P2)(V)=(R)(T2) = (P2)(0.1119)=(0.08205)(1473) so. P2 = 1080atm? am i doing this somewhat right?