Copper oxidizes in air at 1000 degree Celsius with parabolic kinetics, forming a surface film of Cu2O. The parabolic rate constant at this temperature, kp, is 2.1*10-6kg2 /m4 s. What is the mass gain per unit area of the copper surface after an hour

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