If you have 8.5 moles of water (H2O), how many grams of water do you have?

They are all full and don't need any more electrons in there outer shell.

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   

Idon't know hope someone you

Use a magnet to separate iron, evaporate water, i'm not sure how to separate the other two i'm sorry but good luck