A liquid solution of formaldehyde is 37.0% pure. This solution has a specific gravity of 1.037. The molecular weight of formaldehyde is 30.0. to 1.00 ml of this impure stock solution is added quantity sufficient to take the total volume to 500ml. If 1.00 ml of this solution is added to 4ml of water in a final reaction, what is the molarity of formaldehyde in this final reaction tube?
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one tryoy ounce of gold is worth 380.00. There are 33.8 grams per troy ounce. you have a stock colloidal solution of a ver fine gold dust. It's concentration is .10%. From this solution 1.0ml is placed in 9.0ml of an isotonic, pH buffered solution to make a working stock. An assay call for .50 ml of this working stock to which is added .10 ml of serum. What is the cost of gold used for each test?
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