Question

2. We are rapidly filling a balloon with helium from a large
cylinder at a 30 ^{o}C and 5 bar of pressure to a final
volume 0.5 m^{3}. Assume the external
pressure is 1 bar.

a. Determine the final temperature of the helium in the ballon.

Answer #1

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A large weather balloon is filled with 1500 moles of helium at
35.0 degrees C and 1.076 atm. What is its final volume at altitude
where the pressure of the atmosphere is 25.0 Torr and the final
temperature is -350 degrees F?

a. A very flexible helium-filled balloon is released from the
ground into the air at 20. ∘C. The initial volume of the balloon is
5.00 L, and the pressure is 760. mmHg. The balloon ascends to an
altitude of 20 km, where the pressure is 76.0 mmHg and the
temperature is −50. ∘C. What is the new volume, V2, of the
balloon in liters, assuming it doesn't break or leak?
b. Consider 4.20
L of a gas at 365 mmHg...

A. A very flexible helium-filled balloon is released from the
ground into the air at 20. ∘C. The initial volume of the balloon is
5.00 L, and the pressure is 760. mmHg. The balloon ascends to an
altitude of 20 km, where the pressure is 76.0 mmHg and the
temperature is −50. ∘C. What is the new volume, V2, of the balloon
in liters, assuming it doesn't break or leak? Express your answer
with the appropriate units.
B. Consider 4.40...

A helium weather balloon is released from ground level where the
temperature is 20⁰ C. The balloon rises to a maximum height of 8.0
miles above the ground. At this height, the balloon expands to a
volume that is 20 times greater than at the release point, and the
pressure of the helium gas is 25 times smaller than at the release
point. What is the final temperature, in ⁰F, of the gas at the
maximum height of the balloon?

A helium balloon ride lifts up passengers in a basket. Assume
the density of air is 1.28 kg/m3 and the density of
helium in the balloon is 0.18 kg/m3. The radius of the
balloon (when filled) is R = 5 m. The total mass of the empty
balloon and basket is mb = 123 kg and the total volume
is Vb = 0.058 m3. Assume the average person
that gets into the balloon has a mass mp = 70 kg...

1. In an air-conditioned room at 19.0 ∘C, a spherical balloon
had the diameter of 50.0 cm. When taken outside on a hot summer
day, the balloon expanded to 51.0 cm in diameter. What was the
temperature outside in degrees Celsius? Assume that the balloon is
a perfect sphere and that the pressure and number of moles of air
molecules remains the same.
2. A cylinder with a movable piston contains 2.00 g of helium,
He, at room temperature. More...

You have a balloon consisting of Helium, which is
expanded isothermally at 25 ºC from
22.9 dm3
to 32.7 dm3
(i) reversibly, (ii) against a constant external pressure equal to
the
final pressure of the gas, and (iii) freely against zero external
pressure. Determine the work
(w). Please refer to Table Q2(b) for the number of moles of
Helium.
number of mole of helium = 16

A helium balloon ride lifts up passengers in a basket. Assume the
density of air is 1.28 kg/m3 and the density of
helium in the balloon is 0.18 kg/m3. The radius of the
balloon (when filled) is R = 4.9 m. The total mass of
the empty balloon and basket
is mb = 121 kg and the total volume is
Vb = 0.072 m3. Assume the average person
that gets into the balloon has a mass mp = 72 kg
and volume Vp= 0.077 m3.
1)...

A helium balloon ride lifts up passengers in a basket. Assume
the density of air is 1.28 kg/m3 and the density of helium in the
balloon is 0.18 kg/m3. The radius of the balloon (when filled) is R
= 4.6 m. The total mass of the empty balloon and basket is mb = 126
kg and the total volume is Vb = 0.056 m3. Assume the average person
that gets into the balloon has a mass mp = 72 kg...

Initially 5.00 mol of helium (which we can treat as an ideal
gas) occupies volume 0.120 m3 and is at temperature 20.0
∘C. You allow the helium to expand so that its final volume is
0.480 m3 and its final temperature is also 20.0 ∘C.
a)Calculate the net change in entropy of the helium if you make
the helium expand isothermally from 0.120 m3 to 0.480
m3.
b)Calculate the net change in entropy of the helium if you first
increase...

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