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# Answer to Question #170165 in General Chemistry for Grace Smith

Question #170165

The formation of ethyl alcohol (C2H5OH) by the fermentation of glucose (C6H12O6) may be represented by:

C6H12O6  2C2H5OH + 2CO2

If a particular glucose fermentation process is 87.0% efficient, how many grams of glucose would be required for the production of 51.0 g of ethyl alcohol (C2H5OH)?

(a) 68.3 g

(b) 75.1 g

(c) 115 g

(d) 229 g

(e) 167 g

1
Expert's answer
2021-03-09T06:06:03-0500

The reaction coefficients can be related by the unit of mols, which you get from the molar mass.

51g C6H12O6×1 mol glucose

180.156g glucose = 0.1388 mols glucose

If you had 1 mol of glucose, you would get 2 mols ethanol

. So since you have 0.1388 mols

of glucose, you get 0.2775 mols ethanol

.

0.1388 mols glucose × 2 mols ethanol

1 mol glucose =

0.2775 mols ethanol

And this many mols has a mass of...

0.2775 mols CH3CH2OH × 51 g

1 mol EtOH =

115g ethanol

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#### Comments

ian
25.05.21, 12:43

How did you get the 0.1388?

ian
25.05.21, 11:08

how did you get 0.1388?

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