p v = n R T P1 V1/T1 = P2 V2/T2 if n and R constant I guess you want the pressure to be the same? then V1/T1 = V2/T2 so T2 = (V2/V1)T1 T2 = (40/500)400 T2 = 32 k very cold
You can ask a new question or answer this question.