How many grams of zinc nitrate, must be dissolved to prepare 400. mL of a 0.191 M aqueous solution of the salt?

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   

Not a  mixture of two common elements that can be separated by physical means.

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