Which of the following has the greatest mass in grams? a. 0.5 mol lead (pb) atoms b. 1 mole of hydrogen (h) atoms c. 1 atom of silver (ag) d. 25 atoms of iron (fe)

A. 0.5 mol lead (pb) atoms Let's look at the options and see how much they each weigh. A. 0.5 mol lead (pb) atoms * Lead is pretty heavy with an atomic weight of over 200, so this would be a bit over 100 grams. B. 1 mole of hydrogen (H) atoms * Twice as many atoms, but hydrogen only weighs about 1 gram per mole. So A is still has the most mass. C. 1 atom of silver (Ag) * Gotta laugh at this. 1 atom? I don't care how heavy it is, it's gonna have a hard time with about 10^23 lead atoms. So A still has the most mass. D. 25 atoms of iron (Fe) * With that factor of 10^23 going for lead because we're using a half mole, 25 atoms of iron just won't cut it. So of the available choices, we have about 100 grams of lead, about 1 gram of hydrogen. And an unmeasurably small amount of silver and iron. Lead wins easily.

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   

What record? the question is incomplete