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The concentration of glucose in the sample solution is 0.269 mg/ml. If this sample solution is 200 times (ducentuple) diluted, what is the initial concentration?

The concentration of glucose in the sample solution is 0.269 mg/ml. If this sample solution is 200 times (ducentuple) diluted, what is the initial concentration? And if the net volume of this sample is 500 ml, how many grams of glucose is there?

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