Question

An unknown gas has a volume of 50L at 5 atm and -140°C. What is its volume at STP (standard temp = 273K, standard pressure = 1 atm)

Answer 1

$${p_1V_1 \over T_1} = {p_2V_2 \over T_2}$$

$$V_1 = {p_2V_2T_1 \over T_2p_1}$$

$$V_1 = {5*50*273 \over 1*133} = 513L$$