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State whether the following is true or false.
The extent of reaction is a dimensionless quantity.

  • A.True
  • B.False
  • C.True only at large scales
  • D.False only at small scales

Answer: B

It has units of moles, since it multiplies the dimensionless stoichiometric coefficients to give mole changes. Fractional conversion is the dimensionless quantity it is often confused with. Conversion divides by the initial amount of a reactant.

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