What is the molarity of a potassium triiodide solution, KI3(aq), ...

[c0205847]

What is the molarity of a potassium triiodide solution, KI3(aq), if 30.00 mL of the solution is required to completely react with 25.00 mL of a 0.200 M thiosulfate solution, K2S2O3(aq)?
 
  The chemical equation for the reaction is
 
   2 S2O32-(aq) + I3-(aq)  S4O62-(aq) + 3 I-(aq).
 
  A) 0.0833 M
  B) 0.120 M
  C) 0.167 M
  D) 0.333 M

Question 2

If the concentration of OH- is 1  10-2 M, the concentration of H3O+ is ________ M.
 
  A) 1  100
  B) 1  10-2
  C) 1  10-7
  D) 1  10-12
  E) 1  10-14

Question 3

Based on the balanced chemical equation shown below, what volume of 0.250 M K2S2O3(aq), is needed to completely react with 24.88 mL of 0.125 M KI3(aq), according to the chemical equation: 2 S2O32-(aq) + I3-(aq)  S4O62-(aq) + 3 I-(aq).
 
  A) 6.22 mL
  B) 12.4 mL
  C) 24.9 mL
  D) 99.5 mL

Question 4

Calculate the frequency of the green light emitted by a hydrogen atom with a wavelength of 486.1 nm.
 
  A) 1.46  1014 s-1
  B) 6.86  1014 s-1
  C) 4.33  1014 s-1
  D) 6.17  1014 s-1
  E) 1.62  1014 s-1

[Tonyam972]

Answer to Question 1

A

Answer to Question 2

D

Answer to Question 3

C

Answer to Question 4

D

[c0205847]

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[Tonyam972]

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