What mass of bromine reacts completely with 5.6 g of ethene (C = 12, H = 1, Br = 80)?
Correct answer B. 32 g
Explanation
C₂H₄ + Br₂ → C₂H₄Br₂ in a 1 : 1 ratio. Moles of ethene = 5.6/28 = 0.20 mol, so 0.20 mol Br₂ reacts. Mass = 0.20 × 160 = 32 g.
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