Question

at ntp, 5.6 l of a gas weight 8grm. the water vapor density of gas is

Answer 1

weight of 5.6 litre of gas = 8 gm  

so weight of 22.4 litre = 8×22.4/5.6 = 32 gm  

so molecular weight = 32 [ because weight of 22. 4 litre of any gas = molecular weight.]  
we know

vapour density = molecularweight /2

=32/2=16