\( \mathrm{S}(+) \) Mono Sodium Glutamate (MSG) is a flavour enhanc...

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\( \mathrm{S}(+) \) Mono Sodium Glutamate (MSG) is a flavour enhancer used in many foods. Fast foods often contain substantial amount of MSG and is widely used in Chinese food. If one mole of above MSG was placed in \( 845 \mathrm{ml} \) solution and passed through \( 200 \mathrm{~mm} \) tube, the observed rotation was found to be \( +9.6^{\circ} \).
Find out the approximate percentage composition of (-) MSG in a mixture containing (+) MSG and \( (-) \) MSG whose specific optical rotation is \( -20^{\circ} \).
(1) \( 83.3 \% \)
(2) \( 16.7 \% \)
(3) \( 91.6 \% \)
(4) \( 74 \% \)
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