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Problem- Serum taken from a patient being treated with lithium for manic-depressive illness was analyzed for lithium concentration. A reading of 299 units was obtained for the intensity of the 671 nm red emission line. Then 1.00 mL of a 11.3 mM Lithium standard was added to 9.00 mL of serum, and this spiked serum gave an intensity reading of 731 units. What is the original concentration of Li in the serum?

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