Tính độ điện li cảu axit biết hằng số cân bằng cảu axit HA là 1,47*10^-5, có nồng độ Co=0.01M

It shows that the experiment is designed properly.

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 the same molecular formula;

Idon't mean to be a smart alec, length of atoms' bonds is the simplest way to define it.