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2 years ago

Which of the following represents a physical change?

Chemistry

2 answers:

julsineya [31]2 years ago

8 0

A. Phase changing. When phase changes nothing chemically changes about the substance, its still the same thing.

damaskus [11]2 years ago

3 0

I believe the best choice for you to pick will be option A)

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3 years ago

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What characterizes a Homo genesis mixture

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2 years ago

has a standard free‑energy change of − 3.59 kJ / mol at 25 °C. What are the concentrations of A , B , and C at equilibrium if, a

Mamont248 [21]

Answer: The concentrations of A , B , and C at equilibrium are 0.1583 M, 0.2583 M, and 0.1417 M.

Explanation:

The reaction equation is as follows.

$A + B \rightarrow C$

Initial : 0.3 0.4 0

Change: -x -x x

Equilbm: (0.3 - x) (0.4 - x) x

We know that, relation between standard free energy and equilibrium constant is as follows.

$\Delta G = -RT ln K$

Putting the given values into the above formula as follows.

$\Delta G = -RT ln K$

$-3.59 kJ/mol = -8.314 \times 10^{-3} kJ/mol K ln (\frac{x}{(0.3 - x)(0.4 - x)})$

x = 0.1417

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[A] = 0.3 - 0.1417

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[C] = 0.1417 M

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2 years ago

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A, C, E

Explanation:

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