1. How many grams are there in 4.50 moles of Na2SO4 2. What is the volume of 13.20 grams of N2 at STP
3. What is the mass, in grams of 100.0 liters of O2 at STP
4. What is the mass in grams H2 in 7.52*10^24 molecules of H2
5. How many molecules are in 1.39 liters of CH4 at STP

Afraidsugar lol it’s the third one

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