"Synthesis gas" is a mixture of carbon monoxide and water vapor. At high temperature synthesis gas will form carbon dioxide and hydrogen, and in fact this reaction is one of the ways hydrogen is made industrially. A chemical engineer studying this reaction fills a 50L tank with 8.4mol of carbon monoxide gas and 12.mol of water vapor. When the mixture has come to equilibrium he determines that it contains 3.3mol of carbon monoxide gas, 6.9mol of water vapor and 5.1mol of carbon dioxide. The engineer then adds another 2.0mol of carbon monoxide, and allows the mixture to come to equilibrium again. Calculate the moles of hydrogen after equilibrium is reached the second time. Round your answer to 2 significant digits.

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