Many organic reactions result in mixtures of enantiomers in equal amounts, a racemic mixture, which results in zero observable rotation. Chemists have developed selective reactions that result in more of one enantiomer than the other (enantiomer excess). If a mixture of R and S enantiomers has an observed rotation is +25° and the S enantiomer has a +45° rotation, calculate the % enantiometric excess and composition of the mixture.

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