A gaseous mixture contains CH4  and  C2H6 in equimolecular proportion. The weight of 2.24 litres of this mixture at NTP is

Equimolecular proportion means both gases occupied equal volumeVolume of the mixture = 2.24lvolume of   CH4=2.242 =  1.12 L22.4 L  CH4   has mass=16 g1.12 L  CH4  has  mass=1622.4 ×  1.12=0.8 gFor  C2H622.4  L  C2H6  has  mass =  30  g1.12 L  C2H6  has mass 3022.4×  1.12=  3.02 = 1.5gTotal  mass=1.5 g+0.8g=2.3 g.