1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
katovenus [111]
2 years ago
6

The iodine "clock reaction" involves the following sequence of reactions occurring in a reaction mixture in a single beaker. 1.

IO3(aq) + 5I–(aq) + 6H+(aq) → 3I2(aq) + 3H2O(l) 2. I2(aq) + 2S2O32–(aq) → 2I–(aq) + S4O62–(aq) The molecular iodine (I2) formed in reaction 1 is immediately used up in reaction 2, so that no iodine accumulates. In one experiment, a student made up a reaction mixture which initially contained 0.0020 mol of iodate ions (IO3–). If the iodate ions reacted completely, how many moles of thiosulfate ions (S2O32–) were needed in reaction 2, in order to react completely with the iodine (I2) produced in reaction 1? Multiple Choice 0.0020 mol 0.012 mol 0.0040 mol
Chemistry
1 answer:
Mars2501 [29]2 years ago
6 0

C: 0.012 mol.

<h3>Explanation</h3>

Start with 0.0020 moles of iodate ions {\text{IO}_{3}}^{-}.

How many moles of iodine \text{I}_2 will be produced?

{\text{IO}_{3}}^{-} converts to \text{I}_2 in the first reaction. The coefficient in front of \text{I}_2 is three times the coefficient in front of {\text{IO}_{3}}^{-}. In other words, each mole of {\text{IO}_{3}}^{-} will produce three moles of \text{I}_2. 0.0020 moles of {\text{IO}_{3}}^{-} will convert to 0.0060 moles of \text{I}_2.

How many moles of thiosulfate ions {\text{S}_2\text{O}_3}^{2-} are required?

\text{I}_2 reacts with {\text{S}_2\text{O}_3}^{2-} in the second reaction. The coefficient in front of \text{I}_2 is twice the coefficient in front of {\text{S}_2\text{O}_3}^{2-}. How many moles of {\text{S}_2\text{O}_3}^{2-} does each mole of \text{I}_2 consume? Two. 0.0060 moles of \text{I}_2 will be produced. As a result, 2 \times 0.0060 = 0.0120 moles of {\text{S}_2\text{O}_3}^{2-} will be needed.

You might be interested in
Which properties of a substance could change during a<br> PHYSICAL change?
olga2289 [7]
It’s appearance
It’s physical form
What it feels like
How hot it gets
If it melts
Shape
Color
4 0
2 years ago
Calculate the pH of a hydrochloride acid solution, HCl, whose hydronium ion (H3O)+ concentration is 8.29 X 10-4 M.
deff fn [24]

Answer:

Explanation:

Calculate the pH of a hydrochloride acid solution, HCl, whose hydronium ion (H3O)+ concentration is 8.29 X 10-4 M.

Note: answer should have three significant figures

5 0
2 years ago
How many non bonded electron pairs are in the tetracyanoethylene molecule?
algol [13]
Each of the Nitrogen atoms has 2 non bonded valence electrons, meaning that there are 4 pairs total.
8 0
3 years ago
Read 2 more answers
What is the kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency 1.0×1015Hz?
Anvisha [2.4K]
In order to emit electrons, the cesium will have to absorb photons. Each photon will knock out one electron by transferring its energy to the electron. Therefore, by the principle of energy conservation, the energy of the removed electron will be equal to the energy of the incident photon. That energy is calculated using Planck's equation:

E = hf

E = 6.63 x 10⁻³⁴ * 1 x 10¹⁵
E =  6.63 x 10⁻¹⁹ Joules

The electron will have 6.63 x 10⁻¹⁹ Joules of kinetic energy
3 0
3 years ago
63. Use VSEPR theory to predict the structure of these
statuscvo [17]
Sulphate ion is used but fornyour kind information there ain't no place
4 0
3 years ago
Read 2 more answers
Other questions:
  • The combustion of 1.38 grams of a compound which contains C, H, O and N yields 1.72 grams of CO2 and 1.18 grams of H2O. Another
    5·1 answer
  • When might a large volume of material have little mass?
    9·1 answer
  • The taste and odors in fruit are often the result of:
    11·2 answers
  • Another name for resting position in science ?
    14·1 answer
  • Stored energy due to position is know as blank energy
    13·1 answer
  • What are the levels of orgamnization in a biome?
    10·1 answer
  • Given the initial rate data for the reaction A + B –––&gt; C, determine the rate expression for the reaction.
    15·2 answers
  • On a drawing showing the movement of a kickball, you see an arrow above the ball labeled "10 m/s" and the arrow shows BOTH the s
    7·2 answers
  • En la formación del compuesto iónico entre litio y oxígeno. ¿Cuántos electrones recibe oxígeno del átomo de litio?
    14·1 answer
  • The international space station (ISS) orbits in this layer of Earth's atmosphere.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!