The organic compound di‑n‑butyl phthalate, C 16 H 22 O 4 ( l ) , is sometimes used as a low‑density ( 1.046 g ⋅ mL − 1 ) manometer fluid. Compute the pressure in torr of a gas that supports a 463 mm column of di‑n‑butyl phthalate. The density of mercury is 13.53 g ⋅ mL − 1 .

Answer is to avoid experimental error

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   

Heat is involved in chemical change in two ways; chemical changes either result in heat being added to or removed from an object, and chemical changes require a certain amount of heat before they can take place.