Q: A vessel contains 1 mole of O2 (molar mass 32) at a temperature T. The pressure of the gas is p. an identical vessel containing one mole of the gas (molar mass 4) at a temperature 2T has a pressure of
(a) p/8
(b) p
(c) 2 p
(d) 8 p
Ans: (c)
Sol: p V = n R T
or , $\large p = \frac{n R T}{V}$
or , $\large p \propto T $ ; (since V & n are constant)
As temperature is doubled , Pressure also becomes doubled .