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4 years ago

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Solid iron(iii) hydroxide decomposes to produce iron(iii) oxide and water vapor, according to the following reaction: 2fe(oh)3 →

fe2o3 3h2o. if 0.75 l of water vapor is produced at stp,
a. how many grams of iron(iii) hydroxide were used?

1 answer:

garri49 [273]4 years ago

3 0

The balanced chemical reaction is:

2Fe(OH)3 = Fe2O3 + 3H2O

We are given the amount of water vapor to be produced from the reaction. This will be the starting point of our calculations.

0.75 L H2O ( 1 mol / 22.4 L ) ( 2 mol Fe(OH)3 / 3 mol H2O ) ( 106.87 g / 1 mol ) = 2.39 g <span>Fe(OH)3</span>

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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

Hence, at equilibrium

[A] = 0.3 - 0.1417

= 0.1583 M

[B] = 0.4 - 0.1417

= 0.2583 M

[C] = 0.1417 M

5 0

3 years ago

According to the bohr model of the atom, which electron transition would correspond to the shortest wavelength line in the visib

Yuri [45]

n = 6 to n = 2

<h3>Further explanation </h3>

From several sources, we have prepared the following answer choices:

A. n = 2 to n = 5

B. n = 6 to n = 4

C. n = 3 to n = 2

D. n = 6 to n = 2

We will determine which electron transition would correspond to the shortest wavelength line in the visible emission spectra for hydrogen.

The amount of energy released or absorbed by electrons when moving from n₁ level to n₂ level is equal to

$\boxed{ \ \Delta E = -13.6 \Big( \frac{1}{n_2^2} - \frac{1}{n_1^2} \Big) \ }$ in eV.

This energy difference is equal to $\boxed{ \ hf = \frac{hc}{\lambda} \ }$ , where f and λ are the frequency and wavelength of the radiation emitted or absorbed.

Thus, the wavelength is inversely proportional to the energy difference from the electron transition. To get the shortest wavelength, it is determined by the largest ΔE.

From the formula above, we practically only need to calculate part $\boxed{ \ \Big( \frac{1}{n_2^2} - \frac{1}{n_1^2} \Big) \ }$ which is directly proportional to ΔE. Then from the results of the calculation of this section, we will get the shortest wavelength from the largest result..

A. n₁ = 2 to n₂ = 5

$\boxed{ \ \Big( \frac{1}{5^2} - \frac{1}{2^2} \Big) \ }$

$\boxed{ \ -\frac{21}{100} \ }$

By taking the absolute value, we get $\boxed{ \ 0.210 \ }$

B. n₁ = 6 to n₂ = 4

$\boxed{ \ \Big( \frac{1}{4^2} - \frac{1}{6^2} \Big) \ }$

$\boxed{ \ \frac{5}{144} \ }$

We get $\boxed{ \ 0.0347 \ }$

C. n₁ = 3 to n₂ = 2

$\boxed{ \ \Big( \frac{1}{2^2} - \frac{1}{3^2} \Big) \ }$

$\boxed{ \ \frac{5}{36} \ }$

We get $\boxed{ \ 0.1389 \ }$

D. n₁ = 6 to n₂ = 2

$\boxed{ \ \Big( \frac{1}{2^2} - \frac{1}{6^2} \Big) \ }$

$\boxed{ \ \frac{2}{9} \ }$

We get $\boxed{ \ 0.222 \ }$

The last calculation above shows the greatest results so that the shortest wavelength is undoubtedly gained from the electron transition n = 6 to n = 2.

<h3>Learn more</h3>

The energy density of the stored energy brainly.com/question/9617400
Particle's speed and direction of motion brainly.com/question/2814900
The relationship between a single gold atom and the thickness of the atoms in Rutherford's foil brainly.com/question/4929060

Keywords: according to the Bohr model of the atom, which electron transition would correspond, to the shortest wavelength, the visible emission spectra for hydrogen, energy, inversely proportional

5 0

3 years ago

Read 2 more answers

Which statement best describes the substance the result when electrons are transferred from a metal to a nonmetal

labwork [276]

it contains ionic bonds and has high melting point

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3 years ago

One liter of a solution of ph 2 has how many more hydrogen ions (h ) than 1 liter of a solution of ph 6?

omeli [17]

The solution of pH 2 has 6.022 × $10^{4}$ more hydrogen ions than 1 liter of a solution of pH 6 .

Calculation ,

pH = - ㏒ [ $H^{+}$ ] = 2

[ $H^{+}$ ] = $10^{-2}$ = 0.01 M

It means one liter of solution having pH 2 contains 0.01 mole

Since , one mole contains 6.022 × $10^{23}$ hydrogen ions .

So, 0.01 mole contains 6.022 × $10^{23}$ × 0.01 mole /1 mol hydrogen ions

So, 0.01 mole contains 6.022 × $10^{21}$ hydrogen ions

pH = - ㏒ [ $H^{+}$ ] = 6

[ $H^{+}$ ] = $10^{-6}$

It means one liter of solution having pH 2 contains $10^{-6}$ mole

Since , one mole contains 6.022 × $10^{23}$ hydrogen ions .

So, $10^{-6}$ mole contains 6.022 × $10^{23}$ × $10^{-6}$ /1 mole hydrogen ions

So, $10^{-6}$ mole contains 6.022 × $10^{17}$ hydrogen ions

Therefore difference in hydrogen ions = 6.022 × $10^{21}$ - 6.022 × $10^{17}$

= 6.022 × $10^{4}$

to learn about hydrogen ions please click here ,

brainly.com/question/7641960

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2 years ago

What element is mostly used in magnets, gold or cobalt?

JulijaS [17]

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