In an experiment, 3.5g of element A reacted with 4.0g of element G to form a compound

Calculate the empirical formula of this compound.

(relative atomic masses: A=7,
G = 16)

You must show your working.

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

Answer (b) supersaturation;

Reaction type : double replacement hcl + lioh = h2o + licl