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Elan Coil [88]
3 years ago
13

he mineral rhodochrosite [manganese(II) carbonate, MnCO3] is a commercially important source of manganese. Write a half-reaction

for the oxidation of the manganese in MnCO3 to MnO2 in neutral groundwater where the principal carbonate species is HCO3–. Add H2O, H+, and electrons as needed to balance the half-reaction.
Chemistry
2 answers:
valina [46]3 years ago
7 0

Answer:

MnCO_{3}+2H_{2}O-2e^{-}\rightarrow MnO_{2}+HCO_{3}^{-}+3H^{+}

Explanation:

Half reaction:MnCO_{3}\rightarrow MnO_{2}

(1)CO_{3} balance: MnCO_{3}\rightarrow MnO_{2}+HCO_{3}^{-}

(2)H and O balance in acidic medium:MnCO_{3}+2H_{2}O\rightarrow MnO_{2}+HCO_{3}^{-}+3H^{+}

(3) charge balance:MnCO_{3}+2H_{2}O-2e^{-}\rightarrow MnO_{2}+HCO_{3}^{-}+3H^{+}

Hence balanced half-reaction:MnCO_{3}+2H_{2}O-2e^{-}\rightarrow MnO_{2}+HCO_{3}^{-}+3H^{+}

Gelneren [198K]3 years ago
5 0

Answer:

MnCO₃ + 2H₂O → MnO₂  + HCO₃⁻ + 2e- + 3H+

Explanation:

We have to first write out the chemical equation from the information we were given;

MnCO₃ → MnO₂  + HCO₃⁻

Like that, the reaction is unbalanced; in terms of atoms and charges.

It is observed that the oxidation number of Mn changes from +2 in MnCO₃  to +4 in MnO₂ , so two electrons must be added to the right. Since oxidation pretty much means loss of electrons.

The equation leads to;

MnCO₃  → MnO₂  + HCO₃⁻ + 2e-

In terms of electrons, the reaction is balanced.

However, in terms of charges it is not.

In the reactant side, total charge = 0.

In the product side, total charge = -1 + (-2) = -3

To balance this excess negative charge we add add 3 H+ on the product side;

MnCO₃ → MnO₂  + HCO₃⁻ + 2e- + 3H+

In terms of charges, the reaction is balanced.

However, in terms of atoms it is not.

We have excesses of Hydrogen and Oxygen atoms, to balance this we add H20 to the reactant side to balance the H and O atoms

This leads to;

MnCO₃ + 2H₂O → MnO₂  + HCO₃⁻ + 2e- + 3H+

The equation is now balanced.

You might be interested in
The isotope of an unknown element, X, has a mass number of 79. The most stable ion of this isotope has 36 electrons and has a 22
Tema [17]

Answer:

A) False

B) True

C) True

D) True

Explanation:

A) False. If the charge of the atom is +2 means that you have two protons more than number of electrons. If you have 36 electrons you must have <em>38 protons.</em> Also, the electrons are not in the nucleus.

B) True. The isotope of X contains 38 protons, two more than the electron number.

C) True. The mass number is the number of protons + number of neutrons.

If the mass number is 79 and there are 38 protons you must have 41 neutrons.

D) True. You can now the identity of the atom with the number of protons that is the same than atomic number. The strontium, Sr, is the atom with 38 as atomic number.

I hope it helps!

3 0
3 years ago
What are the extensive and intensive properties described in this experiment? Which properties would change and which would stay
kupik [55]

Answer:

No, because the amount of the matter stays the same.

Explanation:

3 0
2 years ago
Read 2 more answers
1. Round each of the following numbers to four significant figures, and express the result in scientific notation:
vfiekz [6]

The rounding up of the aforementioned number to four significant figures is as follows: 3.002 × 10²

<h3>What are significant figures?</h3>

Significant figures are figures that contribute to the general and overall value of the whole number.

Significant figures or digits are specifically meaningful with respect to the precision of a measurement.

Although, the original number given in this question has 9 significant figures, the number; 300.235800 can be rounded up to four significant figures as follows:

  • Decimal notation: 300.2
  • No. of significant figures: 4
  • No. of decimals: 1
  • Scientific notation: 3.002 × 10²

Therefore, the rounding up of the aforementioned number to four significant figures is as follows: 3.002 × 10².

Learn more about significant figures at: brainly.com/question/14359464

#SPJ1

3 0
1 year ago
Convert 175 g of H,O into moles.
devlian [24]

Answer:

9.71397613581

that'll help ya

3 0
3 years ago
A gas sample is collected in a 0.279 L container at 22.7 °C and 0.764 atm. If the sample has a mass of 0.320 g, what is the iden
Sindrei [870]

Answer:

HCl

Explanation:

<em>Choices:</em>

<em>CO: 28.01g/mol</em>

<em>NO₂: 46g/mol</em>

<em>CH₄: 16.04g/mol</em>

<em>HCl: 36.4g/mol</em>

<em>CO₂: 44.01g/mol</em>

<em />

It is possible to identify a substance finding its molar mass (That is, the ratio between its mass in grams and its moles). It is possible to find the moles of the gas using general ideal gas law:

PV = nRT

<em>Where P is pressure of gas 0.764atm; V its volume, 0.279L; n moles; R gas constant: 0.082atmL/molK and T its absolute temperature, 295.85K (22.7°C + 273.15).</em>

Replacing:

PV = nRT

PV / RT = n

0.764atm*0.279L / 0.082atmL/molKₓ295.85K = n

<em>8.786x10⁻³ = moles of the gas</em>

<em />

As the mass of the gas is 0.320g; its molar mass is:

0.320g / 8.786x10⁻³moles = 36.4 g/mol

Based in the group of answer choices, the identity of the gas is:

<h3>HCl</h3>

<em />

4 0
3 years ago
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