Which one of the following changes would cause the volume of a gas to double assuming moles were held constant? a). dropping temperature from 40oC to 20oC at constant pressure b).increasing the pressure from 1 atm to 2 atm at constant temperature c).reducing the pressure from 1 atm to 0.5 atm at constant temperature d).increasing the temperature from 20oC to 40oC at constant pressure (I thought that doubling the temperature, so going from 20 C to 40 C, would cause the volume of gas to double- but I got the question wrong). Could someone please help me figure this out and explain why the answer is the answer. Thank you!