Aniline (18.6 g) is converted to benzenediazonium chloride in 90 % yield, and the diazonium salt is hydrolysed to phenol in 75 % yield. Using atomic masses H = 1, C = 12, N = 14, O = 16, calculate the mass of phenol obtained in grams (answer to two decimal places).

Numerical answer type, tolerance 0.05.

Answer: 12.69

Molar masses:

C X_{6} H X_{5} NH X_{2}

= 93 g/mol and

C X_{6} H X_{5} OH

= 94 g/mol. Moles of aniline = 18.6/93 = 0.200 mol. Overall yield = 0.90 x 0.75 = 0.675, so moles of phenol = 0.200 x 0.675 = 0.135 mol. Mass = 0.135 x 94 = 12.69 g.

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