"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 100 L tank with 11. mol of carbon monoxide gas and 31. mol of water vapor. When the mixture has come to equilibrium she determines that it contains 3.4 mol of carbon monoxide gas, 23.4 mol of water vapor and 7.6 mol of hydrogen gas. The engineer then adds another 4.0 mol of carbon monoxide, and allows the mixture to come to equilibrium again. Calculate the moles of carbon dioxide after equilibrium is reached the second time. Round your answer to 2 significant digits