The molecular weight of glucose is 180g/mol. To prepare a stock solution of glucose, you dissolve 1.8g of glucose in water to a final volume of 1.0L. This stock solution is then diluted as follows: 50mL of the stock solution is added to 450mL of water, and then 1.0mL of the diluted solution is added to 99mL of water. What is the µM concentration of the final solution?

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