Concept explainers
Ethanol

Interpretation:
The balanced chemical equation for the fermentation reaction of sugar to form ethanol and carbon dioxide gas needs to be determined. Also, the mass of ethanol produced from 750 g of sugar needs to be determined.
Concept introduction:
The mole concept provides the relation between moles, mass and molar mass. The mathematical expression of mole concept can write as:
1 mole of any substance contains
Answer to Problem 60A
Mass of ethanol = 383 g
Explanation of Solution
The reaction of fermentation reaction of sugar produces ethanol and carbon dioxide gas. The chemical formula of reactant and products are:
Sugar =
Ethanol =
Carbon dioxide =
Thus the balance chemical equation must be:
The mole ratio relates the moles of reactant with other reactant and product molecules in the balance chemical equation.
Mass of sugar = 750 g
Molar mass of sugar = 180 g/mol
Molar mass of ethanol = 46.0 g/mol
Calculate mass of ethanol produces with the help of mole ratio:
1 mole of sugar = 2 moles of ethanol
Thus, the mass of ethanol = 383 g
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