Find the mass of one atom of uranium-235. recall that the mass in atomic mass units is equal to the mass in grams of one mole of atoms. avagadro's number, 6.022×1023atoms/mole, gives the number of atoms in one mole. give your answer in kilograms to three significant figures.

Lab reagent, hypothesis test. a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl. these six measurements are assumed to be an srs of all possible measurements from solution. they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution. carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.