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3 years ago

How many total electrons are transferred in the redox reaction?

Chemistry

1 answer:

puteri [66]3 years ago

8 0

Answer:

Option D.

Explanation:

Let's balance the hole reaction by the ion electron method.

Al (s) + Cr(NO₃)₂ (aq) – Cr (s) + Al(NO₃)₃ (aq)

We know that oxidation state at ground state is 0.

We determine the half reactions:

Al ⇆ Al³⁺ + 3e⁻

Aluminum increase the oxidation state. This is the oxidation.

Cr²⁺ + 2e⁻ ⇄ Cr

Chromium decrease the oxidation state. It changed from +2 to 0.

This is the reduction. In order to balance the half reactions, we need to multiply by 2 and by 3. In that way, we can cancel the electrons:

(Al ⇆ Al³⁺ + 3e⁻) . 2

(Cr²⁺ + 2e⁻ ⇄ Cr) . 3

We sum the half reactions:

2 Al + 3 Cr²⁺ + 6e⁻ ⇄ 2Al³⁺ + 6e⁻ + 3Cr

We cancel the electrons, so now the balanced reaction is:

2Al + 3Cr(NO₃)₂ → 3Cr + 2Al(NO₃)₃

Final answer: 6 electrons are transferred in the redox reaction.

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ELEN [110]

Answer:

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Explanation:

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7 0

3 years ago

At 85°C, the vapor pressure of A is 566 torr and that of B is 250 torr. Calculate the composition of a mixture of A and B that b

Phantasy [73]

Answer:

Composition of the mixture:

$x_{A} =0.652=65.2$ %

$x_{B} =0.348=34.8$ %

Composition of the vapor mixture:

$y_{A} =0.809=80.9$ %

$y_{B} =0.191=19.1$ %

Explanation:

If the ideal solution model is assumed, and the vapor phase is modeled as an ideal gas, the vapor pressure of a binary mixture with $x_{A}$ and $x_{B}$ molar fractions can be calculated as:

$P_{vap}=x_{A}P_{A}+x_{B}P_{B}$

Where $P_{A}$ and $P_{B}$ are the vapor pressures of the pure compounds. A substance boils when its vapor pressure is equal to the pressure under it is; so it boils when $P_{vap}=P$ . When the pressure is 0.60 atm, the vapor pressure has to be the same if the mixture is boiling, so:

$0.60*760=P_{vap}=x_{A}P_{A}+x_{B}P_{B}\\456=x_{A}P_{A}+(1-x_{A})P_{B}\\456=x_{A}*(P_{A}-P_{B})+P_{B}\\\frac{456-P_{B}}{P_{A}-P_{B}}=x_{A}\\\\\frac{456-250}{566-250}=x_{A}=0.652$

With the same assumptions, the vapor mixture may obey to the equation:

$x_{A}P_{A}=y_{A}P$ , where P is the total pressure and y is the fraction in the vapor phase, so:

$y_{A} =\frac{x_{A}P_{A}}{P}=\frac{0.652*566}{456} =0.809=80.9$ %

The fractions of B can be calculated according to the fact that the sum of the molar fractions is equal to 1.

7 0

3 years ago

Calculate the percentage by mass of nitrogen in ptcl2(nh3)2.

Sav [38]

Molar Mass: 300.0510 g/mol

5 0

3 years ago

What is the molecular equation for the reaction of solid calcium carbonate with aqueous acetic acid.

malfutka [58]

Answer:

The molecular equation for the reaction of CaCO₃ with CH₃COOH is:

CaCO₃ (s) + 2CH₃COOH (aq) → Ca(CH₃COO)₂ (aq) + H₂O (l) + CO₂ (g)

Option 1

Explanation:

CaCO₃ + 2CH₃COOH → Ca(CH₃COO)₂ + H₂O + CO₂

Option 3 is the same equation as option 1, but calcium acetate, does not precipitate, so the formed salt, is not a solid.

Option 2 and 4 are wrong because calcium acetate molecular formula is

Ca(CH₃COO)₂

Ca(CH₃COO)₂ → Ca²⁺ + 2 CH₃COO⁻

5 0

4 years ago

Which change is the best example of a physical change?

Ede4ka [16]

A physical change would be 3) ice cream melting. 1) and 2) are combustion reactions, which are chemical with oxygen, and 4) is an oxidation reaction, also with oxygen. A phase change, or melting, is not a chemical change but a physical one. Therefore 3) ice cream melting is the answer

3 0

3 years ago

Read 2 more answers