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
zysi [14]
2 years ago
12

Iron(II) can be oxidized by an acidic K2Cr2O7 solution according to the net ionic equation: Cr2O72− + 6Fe2+ + 14H+ → 2Cr3+ + 6Fe

3+ + 7H2O If it takes 35.5 mL of 0.0250 M K2Cr2O7 to titrate 25.0 mL of a solution containing Fe2+, what is the molar concentration of Fe2+ in the original solution?
Chemistry
1 answer:
cestrela7 [59]2 years ago
4 0

Answer:

The molar concentration of Fe²⁺ in the original solution is 1.33 molar

Explanation:

Moles of K₂Cr₂O₇ = Molarity x Volume (lit)

                             = 0.025 x 35.5 x 10⁻³

                             = 0.0008875

Cr₂O₇²⁻ + 6 Fe²⁺ + 14 H⁺ → 2 Cr³⁺ + 6 Fe³⁺ + 7 H₂O

From equation

              1 mole K₂Cr₂O₇ used for the oxidation of 6 moles Fe²

0.0008875 mole K₂Cr₂O₇ used for the oxidation of =\frac{6 X 0.0008875}{1} = 0.005325 mole of  Fe²

      Molarity = \frac{No. of moles of solute}{Volume     of solution(lit)}

Molar concentration of  Fe² = \frac{0.005325 X 1000}{25} = 1.33 molar

So molar concentration of Fe²⁺ in the original solution = 1.33 molar

You might be interested in
2020-21 CCS 8SCI SMA 10 P.1.1, 1.22 of 18
Mars2501 [29]

Answer:

d d d d  d d d d  d dd  d d d  d .

f q  q q q q

6 0
3 years ago
Read 2 more answers
Which Of the following compounds is an electrolyte?
Anettt [7]
Hello,

Here is your answer:

The proper answer to this question is option D "<span>sodium hydroxide".

Here is how:

Sodium Hydroxide its a white substance that is a </span><span>electrolyte.

Your answer is D.

If you need anymore help feel free to ask me!

Hope this helps!</span>
8 0
3 years ago
#PLATOFAM
Vsevolod [243]
Ketones and aldehydes are simple compounds that contain a carbonyl group (a carbon-oxygen double bond). They are considered "simple" because they do not have reactive groups like −OH or −Cl attached directly to the carbon atom in the carbonyl group, as in carboxylic acids containing −COOH<span>.

So your answer would be D.).

I hope that this helps. :)</span>
4 0
3 years ago
Read 2 more answers
When a 12.8 g sample of KCL dissolves in 75.0 g of water in a calorimeter the temp. drops from 31 Celsius to 21.6 Celsius. Calcu
Delicious77 [7]

Answer:

Step 1: Calculate qsur (the surrounding is

usually the water)

qsur = ? J

m = 75.0 g water

c = 4.184 J/g

oC

ΔT = (Tfinal- Tinitial)= (21.6 – 31.0) = -9.4 oC

qsur = m · c · (ΔT)

qsur = (75.0g) (4.184 J/g

oC) (-9.4 oC)

qsur = - 2949.72 J

First, using the information we know that we

must solve for qsur, which is the water. We know

the mass for water, 75.0g, the specific heat of

the water, 4.184 j/g

o

c, and the change in

temperature, 21.6-31.0 = -9.4 oC. Plugging it

into the equation, we solve for qsur.

Step 2: Calculate qsys qsys = - (qsur)

qsys = - (- 2949.72 J)

qsys = + 2949.72

In this case, the qsur is negative, which means

that the water lost energy. Where did it go? It

went to the system. Thus, the energy of the

system is negative, opposite, the energy of the

surrounding.

Step 3: Calculate moles of the substance

that is the system

Given: 12.8 g KCl

Mol system = (g system given)

(molar mass of system)

Mol system = (12.8 g KCl)

(39.10g + 35.45g)

Mol system = 12.8 g KCl

74.55 g

Mol system = 0.172

Here, we solve for the mol in the system by

using the molar mass of the material in the

system.

Step 4: Calculate ΔH ΔH = q sys .

Mol system

ΔH= + 2949.72 J

0.172 mol

ΔH= +17179.81 J/mol or +1.72 x 104

J/mol

i hope this helps

7 0
3 years ago
Please help
Alika [10]

Answer:

there is no question to answer :(

4 0
2 years ago
Other questions:
  • How can human behaviors affect our natural resources?
    7·1 answer
  • The energy produced when nucleons fuse together is called the: Select the correct answer below:
    6·1 answer
  • Some organisms are not able to live in an environment where there is oxygen; these types of organisms are called obligate anaero
    14·1 answer
  • I will give brainliest!!! In the reaction represented by the equation Al2O3 -&gt; Al + O2, what is the mole ratio of aluminum to
    6·1 answer
  • SHOW ALL WORK AND INCLUDE UNITS
    7·1 answer
  • What happens to the average kinetic energy when a solid is warming up?
    15·1 answer
  • Suppose you are working in a chemistry lab and trying to make a solution of a substance called Sodium Chloride (which is a solid
    11·1 answer
  • Which action would not help a person stay safe during a tornado? O A. Moving away from outside walls B. Going into a storm shelt
    9·1 answer
  • Canany one heelp me plzzzzzzz
    13·2 answers
  • What r variable's :) :) :) :) :)
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!