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the flammability of alkanes decreases as the hydrocarbon chains increase in length

their evapouration rates decrease as longer chained molecules have higher boling points so temperatures must be high for them to evaporate therefore there is no fumes or vapours for longer chained alkanes at room temp like nonane and so on these hydrocarbons need higher temp to produce vapours n therefore will not burn with just a match

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How does the flammability of a hydrocarbon change as its carbon length increases?

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