A chemist collects gas from a reaction that occurs in aqueous solution. Atmospheric pressure is 1.13 atm, and the temperature of the reaction is 80 °C. What pressure should she use when
calculating the number of moles of product using the ideal gas law?

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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   

Hope you figure it out: )