A gas is expanded, at constant temperature, from a volume of 400 ml to a volume of 1 litre, where its final pressure is 100 mm of Hg. What was the original pressure?

A gas is expanded, at constant temperature, from a volume of 400 ml to

1.	A gas is expanded, at constant temperature, from a volume of 400 ml to a volume of 1 litre, where its final pressure is 100 mm of Hg. What was the original pressure?
Answer» E given,Volume, = 400 ml = 1 L = 1000 mlPressure, = ? = 100 MM of Hg temperature is constantAccording to the Boyle's law,Substitute the given VALUES,Therefore, original PRESSURE is 250 mm of Hg