Nitrogen dioxide is one of the many oxides of nitrogen (often collectively called "NOx") that are of interest to atmosph

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Nitrogen dioxide is one of the many oxides of nitrogen
(often collectively called "NOx") that are of interest to
atmospheric chemistry. It can react with itself to form another
form of NOx, dinitrogen tetroxide. A chemical engineer
studying this reaction fills a 125 L tank with 22. mol of
nitrogen dioxide gas. When the mixture has come to equilibrium he
determines that it contains 11. mol of nitrogen dioxide gas.
The engineer then adds another 5.5 mol of nitrogen dioxide, and
allows the mixture to come to equilibrium again. Calculate the
moles of dinitrogen tetroxide after equilibrium is reached the
second time. Round your answer to 2 significant
digits.