9.3 g of pure aniline upon diazotisation followed by coupling with phenol gives an orange dye. The mass of orange dye produced (assume 100% yield/conversion) is g. (nearest integer)
Answer
20
Solution
[figure]
1 mol aniline ⇒ 1 mol p-hydroxyazobenzene (orange dye, C12H10N2O, M = 198 g mol-1)
Moles of aniline = 9.393 = 0.1 mol
∴ mass of dye = 0.1 198 = 19.8 g 20 g
Answer: 20