Can you fill in the questions marks? Molecular weight Amount mmol Chlorobenzene

Question

Can you fill in the questions marks?

Molecular weight

Amount

mmol

Chlorobenzene

(solvent)

1 mL

--

b. pt. 132 C

p-toluic acid

136.15 g/mol

0.11g

m. pt. 180 C

NBS

177.9 g/mol

0.16g

m. pt. 180 C

ABCN

244.34 g/mol

0.008g

--

m. pt. 155 C

Product –

-bromo-p-toluic acid

215.05 g/mol

Yield

0.025g

??????

m. pt. 228 – 230

Experimental

m. pt.:    

Molecular weight

Amount

mmol

Chlorobenzene

(solvent)

1 mL

--

b. pt. 132 C

p-toluic acid

136.15 g/mol

0.11g

???????

m. pt. 180 C

NBS

177.9 g/mol

0.16g

??????

m. pt. 180 C

ABCN

244.34 g/mol

0.008g

--

m. pt. 155 C

Product –

-bromo-p-toluic acid

215.05 g/mol

Yield

0.025g

??????

m. pt. 228 – 230

Experimental

m. pt.:    

Explanation / Answer

p-toluic acid:

molar mass= 136.15 g/mol

amount obtained=0.11 g

number of moles= 0.11/136.15 = 8.079 x 10-4 moles

1 mole= 1000 mmol

therefore no. of moles=0.8079 mmol

NBS:

molar mass= 177.9 g/mol

amount obtained=0.16 g

number of moles= 0.16/177.9 = 8.994 x 10-4 moles

1 mole= 1000 mmol

therefore no. of moles=0.8994 mmol

ABCN:

molar mass= 244.34 g/mol

amount obtained=0.008 g

number of moles= 0.008/244.34 = 3.274 x 10-5 moles

1 mole= 1000 mmol

therefore no. of moles=0.03274 mmol

-bromo-p-toluic acid:

molar mass= 215.05 g/mol

amount obtained=0.025 g

number of moles= 0.025/215.05 = 1.163 x 10-4 moles

1 mole= 1000 mmol

therefore no. of moles=0.1163 mmol

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