Question

One litre of an unknown gas weighs 1.25 gm at
N.T.P. which of the following gas pertains to the
above data -
(1) CO2
(2) NO2
(3) N2
(4) O2. why​

Answer 1

one litre = 1.25g

22.4l = 22.4*1.25

        = 28g

in ntp condition each gas have 22.4l volume

we know that, molecular mass of compound has 22.4l at stp

so the gas which has molecular mass 28g is N₂(14*2)