A mixture of ethane and an unknown alkene in a 1:1 molar ratio has a density of 1.473 g/l at STP. Identify the alkene.
- Ethene
- Propene
- But-1-ene
- But-2-ene
📝 Detailed explanation
Average molar mass M = 1.473 × 22.4 = 33 g/mol.Let the alkene be CₙH₂ₙ.
(30 + 14n) / 2 = 33.
30 + 14n = 66.
14n = 36.
n ≈ 2.57.
If we check molar mass of Propene (42): (30 + 42) / 2 = 36.
If we check Ethene (28): (30 + 28) / 2 = 29.
The density matches closer to a mixture containing Propene.