) Base-catalyzed (OHF) dehydration of 2-phenylethanol () gives vinyl benzene (ph
ID: 693248 • Letter: #
Question
) Base-catalyzed (OHF) dehydration of 2-phenylethanol () gives vinyl benzene (phenylethylene or styrene) (aIn (o) write the chemical equation for this reaction showing the condensed formulas of the reactant and the products (b) If 15.0 g of (1) were used to produce (ID), how many grams of (II) should be produced? (c) If the percent yield of (11) were 85%, how many grams of (11) were actually produced? The partition coefficient, K p, for the following is 3.0. Given 400 mL of an aqueous solution containing 12 g of compound A, many grams of A could be removed from the solution by two extractions, each one of 100 mL diethyl etherExplanation / Answer
4.
(a)
C6H5CH2CH2OH ----- OH- --------> C6H5CH=CH2
(b)
Mass of 2-phenylethanol = 15.0 g.
Molar mass of 2-phenylethanol = 122.16 g/mol
Moles of 2-phenylethanol = mass / molar mass = 15.0 / 122.16 = 0.123 mol
From the balanced equation,
1 mol of 2-phenylethanol forms 1 mol of vinylbenzene
SO, moles of vinyl benzene = 0.123 mol
Mass of vinyl benzene = 0.123 * 104.15 = 12.8 g.
(c)
% yield = actual yield * 100 / theoretical yield
85 = Actual yield * 100 / 12.8
Actual yield = 10.87 g.
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