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3 years ago

7

When researchers cool a gas, which of the following has occurred? Select all that apply.

2 answers:

Alenkasestr [34]3 years ago

8 0

I think that there would be two correct answers from the choices listed above. When researchers cool a gas, velocity and spacing of particles is reduced and the v<span>olume of substance decreases relative to temperature decrease. Hope this answers the question. Have a nice day.</span>

Ne4ueva [31]3 years ago

5 0

Answer is: Velocity and spacing of particles is reduced and Volume of substance decreases relative to temperature decrease.

Charles' Law (The Temperature-Volume Law) - the volume of a given amount of gas held at constant pressure is directly proportional to the Kelvin temperature:

V₁/T₁ = V₂/T₂.

When temperature goes down, the volume also goes down.

Velocity is equivalent to a specification of its speed and direction of motion, it is a physical vector quantity. Less enegry (lower temperature), lower the velocity.

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nexus9112 [7]

Answer:

Therefore the equilibrium number of vacancies per unit cubic meter =2.34×10²⁴ vacancies/ mole

Explanation:

The equilibrium number of of vacancies is denoted by $N_v$ .

It is depends on

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$N_v=Ne^{-\frac{Q_v}{kT} }$

To find equilibrium number of of vacancies we have find N.

$N=\frac{N_A\ \rho}{A_{cu}}$

Here ρ= 8.45 g/cm³ =8.45 ×10⁶m³

$N_A$ = Avogadro Number = 6.023×10²³

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$N=\frac{6.023\times 10^{23}\times 8.45\times 10^{6}}{63.5}$

$=8.01\times 10^{28$ g/mole

Here $Q_v$ =0.9 ev/atom , T= 1000k

Therefore the equilibrium number of vacancies per unit cubic meter,

$N_v=( 8.01\times 10^{28}) e^{-(\frac{0.9}{8.62\times10^{-5}\times 1000})$

=2.34×10²⁴ vacancies/ mole

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Explanation :

Half-life of chromium-51 = 28 days

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Now we have to calculate the time required for decay.

Expression for rate law for first order kinetics is given by:

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$t=83.9\text{ days}\approx 84\text{ days}$

Therefore, the time required for decay is, 84 days.

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