BONUS Question: (8) A sample of a hydrocarbon compound (contains only carbon and hydrogen) is known...

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Answer 1

Answer #1

At STP we know that 1 mol contain 22.4 L

density of hydrocarbon 3.2215 gm/liter means 3.2215 gm in 1 L

i.e, 1L contain 3.2215 gm

22.4 L contain (3.2215*22.4) gm = 72.1616 gm

Hence 1 mol hydrocarbon = 72.1616 gm

Now 5 carbon atom = 5*12 = 60 gm

No of H atom = (72-60) =12

Hence the molecular formula is C5H12.(pentane)

Answer 2

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