Benzocaine 200 g Polyethylene glycol 400 600 g Polyethylene glycol 3350 ad 1000 g Polyethylene glycol 400 is a liquid (specific gravity = 1.13). How many milliliters of polyethylene glycol 400 are needed in order to prepare 250 grams of the ointment?
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- Seoyeon needs to prepare a 250 mL solution of 0.1000 M Na2CO3. Which glassware should she use to prepare the solution? 250-mL volumetric flask 250-mL graduated cylinder 250-mL Erlenmeyer flask 250-mL beaker For the given data set: [6.7, 7.3, 7.5, 7.2, 7.9, and 7.1] Determine the outlier using Grubbs test. Gcrit = 1.887 6.7 7.9 7.3 7.1 There is no outlier. The results of an analysis for a certain sample are given (in ppm): 20.1, 24.1, 23.5, 22.2, and 21.6. Calculate the 95% confidence interval. 20.3 ppm ≤ x̄ ≤ 24.3 ppm 20.5 ppm ≤ x̄ ≤ 24.1 ppm 20.8 ppm ≤ x̄ ≤ 24.8 ppm 21.0 ppm ≤ x̄ ≤ 24.6 ppmFiltration of samples A, B, and C show no residue left. After letting them dry in different beakers, SAmple A remains no residues. Sample B shows crystal leftovers, and sample C show brown film on the beaker walls. This means that: a. Two or more samples are heterogenous b. Two or more samples are homogenous c. all sample have 2 or more phases d. all samples are pureA student dissolves a Jefferson nickel to make 100.00 mL of solution in a volumetric flask. The student takes a 5.00 mL5.00 mL aliquot of the first solution and dilutes it to make 100.00 mL100.00 mL of a second solution. The student places a sample of the second solution in a cuvette for analysis using spectrophotometry. The molarity of the copper solution in the cuvette was determined by spectrophotometric analysis to be 2.90×10−2 M Cu.2.90×10−2 M Cu. Calculate the mass of copper in the Jefferson nickel used to make the first solution.