A balloon is filled with 0.5 mol of krypton and 0.5 mol of helium at 25 ºC. The balloon is then left at constant temperature and pressure for 24 hours in a sealed room. After the 24 hours is over the balloon's volume will be ________ and the balloon will contain _____.

A. larger/more krypton than helium
B Smaller/more krypton than helium
C. Larger/more helium than krypton