Hey, that isn't nearly scary enough.

According to Wikipedia, there are

  1.94E+02	grams per mole
  6.02E+23	atoms per mole

which works out to

  3.22E-22	grams per atom

Found in the seawater were

  4.50E-08	grams per liter

which means there were

  1.40E+14	atoms per liter

Put in "national debt" units, that is 140 trillion atoms. The current U.S. national debt is only 16.5 trillion[1], so that is 8.5 times as many molecules per liter as the U.S. government owes in dollars.

[1] http://www.brillig.com/debt_clock/