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Concentration of Stock Solution

Please explain how I would figure out this problem:
From 0.80 L of a glucose stock solution, 4.0L of a 1.8% w/v solution of glucose was prepared. What was the concentration of the stock solution?

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How can we solve this problem easily?

We know that the moles of glucose didn't change, right? Therefore, initial moles must equal final moles. Therefore, we can right:

mol(i) = mol (f)

where i and f stand for original and final, respectively.

Next, is Molar x L the same thing as ...

Solution Summary

This solution provides detailed steps and explanations to determine the concentration of the stock solution.