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A natural gas has the following composition by volume: CH₄: 88.7%, C₂H₆: 4.3%, H₂S: 1.5%, and N₂: 5.5%. Calculate the density of the gas at a temperature of 310 K and 103.5 kPa. What would be the density if the gas were diluted with carbon dioxide so that the combustible components of the gas represented 85% by volume of the resulting fuel mixture? Assume ideal gas behavior.