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The value of nD20 for a mixture can be approximatedas the weighted average of the refractive indices ofthe individual components. For a heptane/alpha-pinene mixture nD20 (mixture)=VheptanenD20 (heptane) + VpinenenD20 (pinene) ,where V's stand for volumefractions (for instance, 2mL heptane mixed with 2 mL alpha-pinenegives V = 0.5 for each) Predict nD20 for amixture of 2 mL heptane and 2 mL alpha-pinene in this way

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