The mass of molecule A is twice that of molecule B. The root mean square velocity of molecule A is twice that of molecule B. If two containers of equal volume have same number of molecules, the ratio of pressure PA/PB will be

(a) 8 : 1 (b) 1 : 8 (c) 4 : 1 (d) 1 : 4

Calculate the compressibility factor for C, if one mole of it occupies 0.4 ltr at 300 K and 40 atm. Comment on the result.

(a) 0.40, C is more compressible than ideal gas.

(b) 0.65, C is more compressible than ideal gas.

(c) 0.55, C is more compressible than ideal gas.

(d) 0.62, C is more compressible than ideal gas.