fórm dition dry we tform 1. Data: (15 pts) uridi E-Stilbene Perbromide Dibromide

Question

fórm dition dry we tform 1. Data: (15 pts) uridi E-Stilbene Perbromide DibromideKOH used Acetylene obtained (used) (used) obtained a flo la 95 39.0 a lar (6 5 056 ao. 4 Molecular Weight (g/mole) Grams (g) Moles Melting point (mp, oC) (lit) 'C 380 co Theoretical yield (in grams) of Stilbene Dibromide: Weight of Stilbene Dibromide actually obtained: Percent yield of Stilbene Dibromide: Actual Mp Range of the Stilbene Dibromide Obtained: Theoretical yield (in grams) of Diphenyl Acetylene: Weight of Diphenyl Acetylene actually obtained: Percent yield of Diphenyl Acetylene: Actual Mp Range of the Diphenyl Acetylene Obtained: 0 pts) Sketch the TLC plate result from your two samples and calculate each Rf

Explanation / Answer

Reaction data

stilbene to stilbene dibromide

Initial moles of stilbene = grams/molar mass

grams stilbene taken = 0.5 g

molar mass of stilbene = 180.25 g/mol

So,

moles of stilbene = 0.5 g/180.25 g/mol = 0.003 mol

1 mole of stilbene forms 1 mole of stilbene dibromide

Theoretical moles of stilbene dibromide formed = 0.003 mol

molar mass of stilbene dibromide = 340.058 g/mol

therefore,

theoretical yield of stilbene dibromide = 0.003 mol x 340.058 g/mol = 0.943 g

actual yield of stilbene dibromide = say x g

then,

Percent yield of stilbene dibromide = (x g/0.943 g) x 100

Actual melting point range of stilbene dibromide = 236oC

Stilbene dibromide to diphenyl acetylene

From the theoretical yield from first step,

mass of stilbene dibromide = 0.943 g

moles of stilbene dibromide = 0.003 mol

molar mass of diphenyl acetylene = 178.24 g/mol

1 mole of stilbene dibromide would yield 1 mole of diphenyl acetylene

so, moles of diphenyl acetylene would be formed = 0.003 mols

Theoretical yield of diphenyl acetylene = 0.003 mol x 178.24 g/mol = 0.535 g

now lets say,

actual yield of diphenyl acetylene = say y g

then,

Percent yield of diphenyl acetylene = (y g/0.535 g) x 100

Actual melting point range of diphenyl acetylene = 60oC

[pl. note x and y are not given in th above data]

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