Chemistry - molar mass

Question

parameters of TurboJoda elixir for master Yoda entered: 1. TurboJoda elixir is an aqueous solution of potassium iodate.

2. The daily dose of potassium iodate for Yoda is exactly 90 mg.

3. The daily dose of potassium iodate should be dissolved in exactly 1.00 ml of solution so that the Yoda elixir can be easily swallowed.

f) Calculate the volume of TurboJoda elixir that Yoda needs for 1 year (365 days) and determine how many grams of potassium iodate are needed to prepare it.

g) Calculate the concentration of the amount of potassium iodate in the TurboYoda elixir (the molar mass of potassium iodate is 214.0 g / mol).

Answer 1

f) 1 ml / day x 365 days = 365 mls = 0.365 L

90 mg / day x 365 days = 32,850 mg

32,850 mg x 1 g / 1000 mg = 32.85 g

g) 32.85 g KIO₃ x 1 mol KIO₃ / 214.0 g = 0.1535 moles

[KIO3] = moles / liter = 0.1535 mols / 0.365 L = 0.42 M (2 sig. figs.)