Calculate the no. of moles and the no. of molecules present in 1.4 g of ethylene gas (C₂H₄ ). What is the vol. occupied by the same amount of C₂H₄ . State the vapour density of C₂H₄ . (Avog. No. = 6 x 10²³ ; C = 12, H = 1] (0.05 moles ; 3 x 10²² molecules ; 1.12 lit. ; 14)