The Total solution for NCERT class 6-12
Sincethe student was working in the laboratory, there is no change in pressure.Thus, CharlesтАЩ Law is applicable.According to given data : V1┬а=V L (say) V2┬а= ?T1┬а= 27+273 =300 K; T2┬а= 477 + 273 =750KT1┬а=┬аT2┬аorV2┬а=┬аT1┬а=\frac { (VL)\times (750K) }{ 300K } = 2.5 VLThus, volume of air expelled = 2.5 V тАУ V = 1.5 V 1.5VFraction of air expelled =┬а1.5V┬а=┬а3┬а.