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fiasKO [112]
3 years ago
8

At which of the following temperatures is the average kinetic energy of the molecules of a substance the greatest?

Chemistry
2 answers:
WINSTONCH [101]3 years ago
6 0

D. The higher the temperature the more the atoms are shifting and shaking around

liubo4ka [24]3 years ago
3 0

Answer:  65.4^0C

Explanation:

Average kinetic energy is defined as the average of the kinetic energies of all the particles present in a system. It is determined by the equation:

K=\frac{3RT}{2}

R= gas constant

T= temperature in kelvin

From above, it is visible that kinetic energy is directly related to the temperature of the system. So, if temperature is more, average kinetic energy of the system is more and vice-versa.

a. 18^0C=18+273=291K

b. 20.4^0C=20.4+273=293.4K

c. 36.2^0C=36.2+273=309.2K

d. 65.4^0C=65.4+273=338.4K

Thus substance at 65.4^0C will have greatest kinetic energy.

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Heat required = Q = 40 kcal

<h3>Further explanation</h3>

Given

mass of 500 g ice

Required

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Solution

The heat to change the phase can be formulated :  

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The conversion factor of joule to kilocalories is 
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x = \frac{256}{4184} = 0.0611 kilo calories

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8 0
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Explanation:

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