Question

virtual lab: For this lab you will be calculating the molecular mass of an unknown solid using freezing point depress 1. Perform the virtual lab and use the information determined to calculate rate constant k. Show all your work am any assumptions that you make. (You may write on the back of this paper) door A ha e same voolume ,001 M Trial H20 .04M KBro3 Na2S203 cl vor St Fill out the chart put the concentration of each in the box not the number of drops. Concentration is moles/to So take the drops of each compound and change it to moles and divide by the total volume 10 drops. art on thi

the table shows the molarity of compounds that react for different trials in the reaction.Asked to use that to calculate moles of bro3- produced.

Answer 1

Assuming that S₂O₃^2- is used to react with I₂ producing I^-

MiliMoles of S₂O₃^2- in 1 drop = 0.056ml x 10^-4 M = 5.6 x 10^-6

2 moles of S₂O₃^2- produces 2 moles of I^-

5.6 x 10^-6​ Millimoles of S₂O₃^2- produces 5.6 x 10^-6​ Millimoles of I^-

MilliMoles of I^- taken from outside (in 2 drops) = 0.002 x (2 x 0.056) = 2.2 x 10^-4

Total Millimoles of I^- = 2.256 x 10^-4

Now 6 moles of I^- reacts with 1 mole of BrO₃^-, so 2.256 x10^-4 millimoles of I^- will react with 2.256 x 10^-4/6 millimoles of BrO₃^-.

Millimoles of BrO₃^- reacted = 3.76 x 10^-5