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Luden [163]
3 years ago
7

Why can't chemical changes be reversed?

Chemistry
1 answer:
Temka [501]3 years ago
7 0
<span>a chemical change results in the formation of one or more new substances</span>
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For the reaction Fe3O4(s) + 4H2(g) --&gt; 3Fe(s) + 4H2O(g)
mojhsa [17]

Answer : The value of equilibrium constant for this reaction at 328.0 K is 1.70\times 10^{15}

Explanation :

As we know that,

\Delta G^o=\Delta H^o-T\Delta S^o

where,

\Delta G^o = standard Gibbs free energy  = ?

\Delta H^o = standard enthalpy = 151.2 kJ = 151200 J

\Delta S^o = standard entropy = 169.4 J/K

T = temperature of reaction = 328.0 K

Now put all the given values in the above formula, we get:

\Delta G^o=(151200J)-(328.0K\times 169.4J/K)

\Delta G^o=95636.8J=95.6kJ

The relation between the equilibrium constant and standard Gibbs free energy is:

\Delta G^o=-RT\times \ln k

where,

\Delta G^o = standard Gibbs free energy  = 95636.8 J

R = gas constant  = 8.314 J/K.mol

T = temperature  = 328.0 K

K = equilibrium constant = ?

Now put all the given values in the above formula, we get:

95636.8J=-(8.314J/K.mol)\times (328.0K)\times \ln k

k=1.70\times 10^{15}

Therefore, the value of equilibrium constant for this reaction at 328.0 K is 1.70\times 10^{15}

3 0
3 years ago
Nicole has a 5 lb bag of carrots and a 2 oz bag<br>of carrots. How much does Nicole have in total?​
svp [43]

Answer:

5 pounds 2 ounces.

Explanation:

1 pound = 16 ounces

So just add the 2 ounces to the pounds.

4 0
3 years ago
What was Thompson’s model of the atom called
shtirl [24]

J. J. Thomson, who discovered the electron in 1897, proposed the plum pudding model of the atom in 1904 before the discovery of the atomic nucleus in order to include the electron in the atomic model. In Thomson's model, the atom is composed of electrons (which Thomson still called “corpuscles,” though G. J.

4 0
3 years ago
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What is the molarity of a solution that contains 17g of NH₃ in 0.50L of solution?
erastovalidia [21]

Explanation:

Because molarity is mol/L, we'll have to convert 17g to mol.

After obtaining the mol, we'll divide that by the volume to obtain Molarity.

3 0
3 years ago
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What compounds can you find in a whole wheat bread
givi [52]

Explanation:

Three major bitter compounds in whole wheat bread crumb were identified.

...

Apigenin-6-C-arabinoside-8-C-galactoside. ...

Apigenin-6-C-galactoside-8-C-arabinoside. ...

9,12,13-Trihydroxy-trans-10-octadecenoic acid (pinellic acid)

5 0
2 years ago
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