Find the number of moles of argon in 452 g of argon

No. of moles = given mass/atomic mass

= 452/40

= 11.3.

Thus, there are 11.3 moles

Nó of moles =given mass/molar mass
no of moles=452/39.9
therefore no of moles=11.3moles

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   

Mars contains iron oxide in its crust