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Four tanks A, B, C, and D are filled with monatomic ideal gases. For each tank,

ID: 2298877 • Letter: F

Question

Four tanks A, B, C, and D are filled with monatomic ideal gases. For each tank, the mass of an individual atom and the rms speed of atoms are expressed in terms of "m" and "v max" respectively. Suppose that m = 1.89 * 10^-26 and v max = 900 m/s. Find the temperature of each tank.

                             A                               B                                   C                                    D

Mass                     m                              m                                 2m                                   2m

rms speed             v rms                         2v rms                          v rms                                2v rms

A = _____________

B = ______________

C = ______________

D = ______________

Explanation / Answer

The rms speed of a monoatomic gas is given by :

rms = sqrt ( 3 * R * T / molar mass )

now molar mass = avogadro number * mass of each atom = mass of atom * 6.023 * 10^23
mass of atom = k*m = k*1.89 * 10^-26

rms = sqrt ( 3*8.314 * T / (6.023*10^23 * k* 1.89*10^-26 ) )

so.. rms = sqrt ( 2191.07179 * T / k )


for A ...
mass of atom = m
so.. k = 1

rms = v = 900

so.. 900 = sqrt ( 2191.07179 * T / k ) = sqrt ( 2191.07179 * T / 1 )
so.. Temperature = T_A = 369.6821 K = 369.6821 - 273 = 96.6821 Celcius

for B ...
mass of atom = m
so.. k = 1

rms = 2v = 2*900

so.. 1800 = sqrt ( 2191.07179 * T / k ) = sqrt ( 2191.07179 * T / 1 )
so.. Temperature = T_B = 1478.72836 K = 1478.72836 - 273 = 1205.72836 Celcius

for C ...
mass of atom = 2m
so.. k = 2

rms = v = 900

so.. 900 = sqrt ( 2191.07179 * T / k ) = sqrt ( 2191.07179 * T / 2 )
so.. Temperature = T_C = 739.36418 K = 739.36418 - 273 = 466.36418 Celcius

for D ...
mass of atom = 2m
so.. k = 2

rms = 2v = 2*900

so.. 1800 = sqrt ( 2191.07179 * T / k ) = sqrt ( 2191.07179 * T / 2 )
so.. Temperature = T_D = 2957.4567 K = 2957.4567 - 273 = 2684.4567 Celcius

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