QUESTION 21

1. Which of the following relationships is/are CORRECT for gases?

   	1.	The amount of a gas (in moles) is inversely proportional to its volume (at constant temperature and pressure).
   	2.	The volume of a gas is directly proportional to its temperature in kelvin (at constant pressure and moles).
   	3.	The pressure of a gas is inversely proportional to its temperature in kelvin (at constant volume and moles).

   		1 and 2
   		3 only
   		2 only
   		2 and 3
   		1 only