Question

Many breads arc made by adding yeast to dough, causing the dough to rise. Yeast is a type of microorganism that produces the catalyst zymase, which converts glucose, C6H12O6' to ethanol and carbon dioxide gas. The balanced equation for this reaction is shown below.

C6H12O6(aq) 2 C2H5OH(aq) + 2 CO2(g)

73 Draw a structural formula for the ethanol formed during this reaction.
74 Describe how the catalyst, zymase, speeds up this reaction.
75 Determine the total mass of ethanol produced when 270. grams of glucose reacts completely to form ethanol and 132 grams of carbon dioxide.

Answer 1

73. Ethanol has 2 carbons connected to each other. One carbon has 3 H attached and the other atom has 2 H attached and an -OH attachment 
      H   H
       l     l
H - C - C - OH
       l     l
      H    H

74. Activation energy is lowered. 
75. Note: MW glucose is 180g/mol ; MW ethanol is 46 g/mol; there is 2 moles of ethanol produced by one mole of glucose. 

g glucose= 270 glucose (1mol/180g)(2mole ethanol/1mol glucose)(46g/mol)= 138 g ethanol