How many moles of solute are present in a sodium chloride solution with a total volume of 1.25 L if the solutions known concentration is 0.330 M?
3.788 mol NaCl
0.264 mol NaCl
1.58 mol NaCl
24.14 mol NaCl
0.413 mol Naci

How are isotopes of the same chemical element alike? how are they different?

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.

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.