Ch12_2
New Problems
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Make sure to calculate your answers in SI units unless specified otherwise .
1) An ideal gas in a
liter
container is at a temperature of
o
C
and under
atm
pressure. What is the number of gas molecules in multiples of 10
20
(divide your result by 10
20
)
(see sheet 3,14,15)
. Indicate with a positive (negative) sign whether the number of moles
n
can (cannot) be calculated from the mass of the gas present and its molar mass.
2) The temperature of an ideal gas at
atm
pressure in a closed container is increased from
o
F
to
o
F
. What is the final pressure in
atm
(see sheet 3,17
for the "ratio method"
)
? Indicate with a positive (negative) sign whether one can (cannot) calculate the container volume from the data given.
3) A container holds
grams
Oxygen molecules at
o
K
. What is the internal (translational kinetic) energy of the gas
(see sheet 15,23
and consider that the Oxygen molecule has 2 atoms
)
? Indicate with a positive (negative) sign whether the internal energy is less (greater) than the average kinetic energy of the molecules.
4) What is the average (translational) kinetic energy of the atoms contained in moles of helium at
o
C
(see sheet 15,24)
Indicate with a negative (positive) sign whether the universal Boltzmann constant
k
is (is not) the ratio of the universal gas constant
R
and Avogadro's universal number
N
A
?
5) Calculate the root-mean-square (
rms
) velocity of Oxygen molecules at
o
C
(see sheet 24)
. Indicate with a negative (positive) sign whether all molecules have this velocity (this value is an average for the molecules present).
6) What is the ratio of the average kinetic energy of Helium atoms over the average kinetic energy of Neon atoms both at
o
K
(see sheet 24)
? Indicate with a positive (negative) sign whether the corresponding ratio of the
rms
velocities is the same (not the same).
Once you have submitted your answers for grading by clicking the grade button, you
cannot resubmit answers
for the same Problem Set--you must use the 'New Problems' button first.