SOLUTION: A certain gas sample has a volume of 40.00 L at 273 K. At constant pressure the volume increase to 50.00 L. What will be the final temperature of the gas?

Use the Charles' law. It states that under constant pressure, an ideal gas' volume is proportional 
to its absolute temperature. The volume of a gas at constant pressure increases linearly with 
the absolute temperature of the gas. The formula he created was 

     = ,


where T denotes absolute temperature (in Kelvins).


In your case,   = .


From the proportion,   =  = 341.25 K.    ANSWER