An open flask containing air is heated from 300 K to 500 K. What percentage of air will be escaped to the atmosphere, if pressure is keeping constant?

V1=V,T1=300K,T2=500K,V2=?At constant pressure V1T2=V2T1∴ V2=V1T2T1=V×500300=5V3∴Volume of air escaped = final volume - initial volume      =5V3−V=2V3∴% of air escaped =2V/35V/3×100=40%