Consider the following chemical reaction: Mg (s) + ZnCl2 (aq) → MgCl2 (aq) + Zn (s) If the reaction started with 45.0 g of Mg and 297.6 g of Zinc Chloride and yielded 176.5 g of Magnesium Chloride, how much Zinc is in the product?

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