Question -
A glass tube of volume 112 ml containing a gas is partially evacuated till the pressure in it drops to 3.8×10−5 torr at 00C. The number of molecules of the gas remaining in the tube is
Options:
A .  3.7×1017
B .  1.5×1014
C .  4.5×1018
D .  1.5×1019
Answer: Option B : B PV=nRT n=PVRT=3.8×10−5×112×10−362.4×273 =0.02461×10−8mol No. of molecules = 0.02461×10−8mol =1.5×1014
Submit Your Solution hear: