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inna [77]
2 years ago
9

Which sample has particles with the lowest average kinetic energy?

Chemistry
2 answers:
Thepotemich [5.8K]2 years ago
7 0

Answer : Option 4) 9.0 g of I_{2} at 20°C


Explanation : Usually the average kinetic energy depends upon the state of the matter. Considering about the iodine at lower temperature the kinetic energy is found to be low. Whereas at higher temperature has higher kinetic energy value.


From the kinetic energy equation it can be easily related that K.E. is directly proportional to the temperature.


Refer the attached image for the relationship of temperature with kinetic energy.

Anastasy [175]2 years ago
3 0
The question asks average kinetic energy. So it is only related with the temperature. The higher temperature is, the higher kinetic energy is. So the answer is (4).
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When the reaction equation is:

HF ↔ H+   +   F-

and when the Ka expression
= concentration of products/concentration of reactions

so, Ka = [H+][F-]/[HF]

when we assume:

[H+] = [F-] = X

and [HF] = 0.35 - X

So, by substitution:

6.8 x 10^-4 = X^2 / (0.35 - X) by solving for X

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∴[H+] = X = 0.015

when PH = -㏒[H+]

∴PH = -㏒0.015

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3 years ago
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The begining is in the reaction:

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1.67 mol . 32.05 g/mol = 53.6 g

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