A cylinder of 2.00dmcube capacity contains dry gas at a pressure of the gas is droped to 300kpa. What will be the new volume at a temperature of half initial?

Answer 1

P1V1/T1 = P2V2/T2 and V1 = 2 and P2 = 300 so
P1*2/T1 = 300*V2/T2 but
T2 = 1/2*T1 or 2T2 = T1 so I can substitute 2T2 for T1 but that leaves me with two unknowns; i.e., P1 and V2. You need to know the value of P1 to solve the equation.