Which statement about the extent of reaction (?) is true?
A. Each product and reactant in a reaction has a unique ? associated with it.
B. The sign of ? alone indicates if the substance is a product, reactant or both.
C. The ? of a reaction can also be expressed on a time basis.
D. ? is unitless.
E. ? divided by ? is the measure of reaction completion.
C. In this case we use the symbol ? ?. See Section 14.2.2.
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