1 mol of a gaseous aliphatic compound is completely burnt in an excess of oxygen. The contraction in volume is

Question

1 mol of a gaseous aliphatic compound  is completely burnt in an excess of oxygen. The contraction in volume is

Canvas Classes · Accepted Answer

Write the general combustion and count gas volumes before and after. Water condenses to liquid, so it leaves the gas phase — that is where the contraction comes from.

(oxygen balance:  needed , since the compound already carries  oxygen atoms)

Gas before ( compound  ):

Gas after ( only; water is liquid):

Contraction  before  after

Watch out: the water is condensed at the measuring conditions, so it is not part of the final gas — leaving it in the count wipes out the contraction. Also s

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