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il63 [147K]
2 years ago
15

In your opinion, why do you think the atomic models are not final?

Chemistry
1 answer:
julia-pushkina [17]2 years ago
7 0

Answer:

because they change

Explanation:

It was based on theories and discoveries

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A chemist prepares a sample of helium gas at a certain pressure, temperature and volume and then removes all but a fourth of the
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Answer:

The temperature must be changed to 4 times of the initial temperature so as to keep the pressure and the volume the same.

Explanation:

Pressure in the container is P and volume is V.

Temperature of the helium gas molecules =T_1

Molecules helium gas = x

Moles of helium has = n_1= \frac{x}{N_A}

PV = nRT (Ideal gas equation)

PV=n_1RT_1...[1]  

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Molecules of helium left after removal = \frac{x}{4}

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PV=n_2RT_2...[2]

n_1RT_1=n_2RT_2

\frac{x}{N_A}\times T_1=\frac{x}{4\times N_A}\times T_2

T_1=\frac{T_2}{4}

T_2=4T_1

The temperature must be changed to 4 times of the initial temperature so as to keep the pressure and the volume the same.

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