The molar masses of three gases, a, b, and c, are 4 grams, 16 grams, and 32 grams respectively. which sentence represents the effusion rates of these gases?
a). a < b < c
b). c < b < a
c). b < c < a
d). b < a < c

Butterfly wingspan is 7.7

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   

Your question is not clear but if you can explain yourself i would be glad to .  just trying to : ))