fractional distillation

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water - freezes at 0 degrees

carbon dioxide - freezes at - 79 degrees

oxygen - boils at - 183 degrees

nitrogen - boils at - 196 degrees

temperature - 200 degrees

oxygen = liquid

nitrogen = liquid

temperature - 190 degrees

oxygen = liquid

nitrogen = gas

temperature -185 degrees

oxygen = liquid

nitrogen = gas

1. air cooled to - 200 degrees

oxygen & nitrogen are liquids

2. warm liquid air to - 185 degrees

nitrogen boils and evaporates

most oxygen stays as liquid some evporates

3. liquid oxygen removed

4. temperature is reduced to - 190 so any oxygen condenses

nitrogen gas collected

liquid with lower boiling point evaporates first

hexane boils at 69 and octane at 126

at bottom temp is 100 hexane boils octane a liquid

top temp = 75 hexane gas collecetd

freezing & boiing points of gases

what States?

fractional distillation of air