08/27/19

Calculate the concentration of a solution made by diluting 87.0 mL of 4.9 M HBr to a final volume of 575.0 mL. Significant figures are graded for this problem.
I'm not sure how to solve this problem. Any help would be super appreciated.
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08/27/19

How many microliters of a 832.0 ppm Co 2+ 832.0 ppm Co2+ stock solution are required to prepare 11.00 mL 11.00 mL of a 19.0 ng/𝜇L Co 2+ 19.0 ng/μL Co2+ solution?
I have no idea how to solve this so a little help would be appreciated.
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08/27/19

Using the correct number of significant figures, calculate the volume of a rectangular glass tabletop that is 60.0 in long, 36.0 in wide, and 0.66 in thick. Report your answers in metric units.
I need to know the correct significant figures to use for the answer, because my online homework keeps telling me that the answers, 23360, 23361.4, 23361.0, 23300.0, 23300, etc. are close to the... more
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Expert Answers •2

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