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3 years ago

Consider these changes.

Chemistry

1 answer:

Ede4ka [16]3 years ago

3 0

Answer:

(a) The system does work on the surroundings.

(b) The surroundings do work on the system.

(d) No work is done.

Explanation:

The work (W) done in a chemical reaction can be calculated using the following expression:

W = -R.T.Δn(g)

where,

R is the ideal gas constant

T is the absolute temperature

Δn(g) is the difference between the gaseous moles of products and the gaseous moles of reactants

R and T are always positive.

If Δn(g) > 0, W < 0, which means that the system does work on the surroundings.

If Δn(g) < 0, W > 0, which means that the surroundings do work on the system.

If Δn(g) = 0, W = 0, which means that no work is done.

(a) Hg(l) ⇒ Hg(g)

Δn(g) = 1 - 0 = 1. W < 0. The system does work on the surroundings.

(b) 3 O₂(g) ⇒ 2 O₃(g)

Δn(g) = 2 - 3 = -1. W > 0. The surroundings do work on the system.

(c) CuSO₄.5H₂O(s) ⇒ CuSO₄(s) + 5H₅O(g)

Δn(g) = 5 - 0 = 5. W < 0. The system does work on the surroundings.

(d) H₂(g) + F₂(g) ⇒ 2 HF(g)

Δn(g) = 2 - 2 = 0. W = 0. No work is done.

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2 years ago

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Due to the fact that ice is less thick than liquid water, the phase diagram of water has an odd melting point that drops with pressure. Carbon dioxide cannot exist as a liquid at atmospheric pressure, according to the phase diagram of the gas. Thus, gaseous carbon dioxide directly sublimes from solid carbon dioxide.

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Be sure to answer all parts. For the complete redox reactions given here, write the half-reactions and identify the oxidizing an

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Answer : $O_2$ is the oxidizing agent and Fe is the reducing agent.

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Reducing agent : It is defined as the agent which helps the other substance to reduce and itself gets oxidized. Thus, it will undergo oxidation reaction.

Oxidizing agent : It is defined as the agent which helps the other substance to oxidize and itself gets reduced. Thus, it will undergo reduction reaction.

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$4Fe+3O_2\rightarrow 2Fe_2O_3$

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In order to balance the electrons, we multiply the oxidation reaction by 4 and reduction reaction by 3 then added both equation, we get the balanced redox reaction.

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Thus, $O_2$ is the oxidizing agent and Fe is the reducing agent.

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3 years ago