A certain element contains 75% of an isotope of mass number X and 25% of an isotope of mass number Y. Select one or more: The atomic weight of the element is closer to X than it is to Y.
The atomic weight of the element is closer to Y than it is to X.
The element is Manganese [atomic number 25).
The element is Osmium [atomic number 75).
The element is Tin [atomic number 50).
There is not enough information to tell which element is represented.

What volume of a 2.00 m stock solution of naoh is needed to prepare 150. ml of 0.40 m solution?

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml

What is the value of keq for the reaction expressed in scientific notation?