Number of grams of bromine that will completely react with 5.0 g of pent-1-ene is × . (Atomic mass of ) [Nearest Integer)
Answer: 1143
Solution
The reaction is:
Molar mass of pent-1-ene (C₅H₁₀) = 5(12) + 10(1) = 70 g/mol
Molar mass of Br₂ = 2(80) = 160 g/mol
Moles of C₅H₁₀ = 5.0/70 mol
Since the reaction is 1:1, moles of Br₂ required = 5.0/70 mol
Mass of Br₂ = (5.0/70) × 160 = 11.428 g
= 1142.8 × 10⁻² g
≈ 1143 × 10⁻² g
Therefore, the answer is 1143.
Molar mass of pent-1-ene (C₅H₁₀) = 5(12) + 10(1) = 70 g/mol
Molar mass of Br₂ = 2(80) = 160 g/mol
Moles of C₅H₁₀ = 5.0/70 mol
Since the reaction is 1:1, moles of Br₂ required = 5.0/70 mol
Mass of Br₂ = (5.0/70) × 160 = 11.428 g
= 1142.8 × 10⁻² g
≈ 1143 × 10⁻² g
Therefore, the answer is 1143.
JEE Main · 2022 · 25 Jun 2022 · Shift 1 · Integer answer