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If a sample contains $75.0\%$ (by mass) of (1S, 2S)-pseudoephedrine and $25.0\%$ (by mass) of (1R, 2R)-pseudoephedrine, what is the enantiomeric excess of the mixture?

A

$100\%$

B

$75\%$

C

$50\%$

D

$300\%$

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