- What is purity powerman?

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The half-life of barium-139 is 86 minutes. If you start with 100 grams of barium-139, how much will be left at the end of 4 half-lives? If I give the answer for critical value is it the same as p value? How would I find the eigenvalues of a 2 x 2 matrix? The first row is 3, 2 and the second row is 3, 8.? You have 19g sample of ethanol with density of 0.7893 g/mL. What volume of ethanol do you have? Which layer benzoic acid, benzoate ion, and biphenyl are in each step of the acid-base extraction and isolation of benzoic acid and biphenyl?