Atank contains 1000 l of a solution consisting of 100 kg of salt dissolved in water. pure water is pumped into the tank at a rate of 5 l/s, and the mixture (kept uniform by stirring) is pumped out at the same rate. how long will it be until only 10 kg of salt remains in the tank?

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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   

It is sure ( overimitation)