what is the molar mass of a polystyrene molecule consisting of 5000 monomers?
2007-04-16 07:38:02 · 3 answers · asked by Vienna 3 in Science & Mathematics ➔ Chemistry
each monomer of styrene is 104.15 g/mole
styrene is has a phenyl ring attached to a vinyl group. the vinyl group double bond breaks and attaches to another styrene monomer during polymerization. no loss of protons.
the 2 end groups, however, end up with the vinyl carbon attached to the ring having only three bonds. so I believe they pick up a proton each.
ie mw = # monomers x mw / monomer + 2 = 5000 x 104.15 + 2 = 520752 g/mole
2007-04-16 07:58:11 · answer #1 · answered by Dr W 7 · 1⤊ 0⤋
When styrene polymerizes, I don't believe that any thing in the molecule is eliminated. So, just calculate (or look up) the molar mass of styrene and multiply it by 5000.
2007-04-16 07:44:41 · answer #2 · answered by hcbiochem 7 · 0⤊ 0⤋
i think i agree with hcbiochem that no atoms are gained or lost in the formation of polystyrene from styrene
styrene is C8H8 giving it a molar mass of 104.16 g/mol
multiply that by 5000 to get 520800 g/mol
2007-04-16 07:56:47 · answer #3 · answered by blackcat3556 4 · 0⤊ 0⤋