Yeast ferments 5 mol of glucose in a closed vat…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Yeast ferments mol of glucose in a closed vat. One mole of ethanol has a mass of g. One mole of ATP holds kJ.
- How many moles of ethanol are made?
- What is the mass of the ethanol?
- How many moles of carbon dioxide are released?
- How many moles of ATP are gained, net?
- How much energy is kept in this ATP?
Need a reminder? The key ideaShow
Without oxygen, pyruvic acid takes the hydrogen of NADH, and NAD is made again. Alcoholic fermentation: pyruvic acid decarboxylase gives acetaldehyde and carbon dioxide, then alcohol dehydrogenase gives ethanol. Lactic acid fermentation: lactate dehydrogenase gives lactic acid and no carbon dioxide. The net gain is ATP for each glucose.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Glucose: mol.
Plan. Use the balance for one glucose, then multiply.
Step 1. Ethanol. mol.
Step 2. Mass. g.
Step 3. Carbon dioxide. mol.
Step 4. ATP. mol.
Step 5. Energy. kJ.
Answer: mol; g; mol; mol; kJ.
Check. The moles of ethanol and of carbon dioxide are equal, as in the equation for one glucose.
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