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Which hydrocarbons are gases at room temperature?

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(state at room temperature). Name. CH4 (gas), methane. C2H6 (gas), ethane. C3H8 (gas), propane. C4H10 (gas), butane. C5H12 (liquid), pentane, pent = 5. C6H14 (liquid), hexane, hex = 6. C7H16 (liquid), heptane, hept = 7. C8H18 (liquid), octane, oct = 8. C9H20 (liquid), nonane, non = 9. read more

In general, the larger molecules will be liquids, the smaller molecules gases. Boiling point depends on the forces between molecules. These are larger for larger molecules. read more

Small alkanes, forces cannot attract molecules enough ( at room temperature) to be a liquid and so are gases, by pentane C5H12, the hydrocarbon can be a liquid. Increasing chain length brings increasing boiling point and viscosity until the alkanes become waxes and then soft solids. read more

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