A 5.6 g sample of an alkene reacts completely with 16 g of Bromine. Identify the number of hydrogen atoms in one molecule of this alkene.
- 4
- 6
- 8
- 10
📝 Detailed explanation
CₙH₂ₙ + Br₂ → CₙH₂ₙBr₂.Moles Br₂ = 16 / 160 = 0.1 mol.
Molar mass of alkene = 5.6 / 0.1 = 56 g/mol.
14n = 56, so n = 4.
Formula is C₄H₈.
The number of hydrogen atoms is 8.