Question

A SCUBA tank, an air tank used for breathing under water, is
initially filled with gas at a pressure of 2.3x10^{7} Pa
and 25 ^{o}C. The tank has a volume of 16.0 L. If the tank
will continue to provide air until it reaches a pressure of
2.5x10^{6} Pa, how many moles of gas will it provide to a
diver diving in water at 6 ^{o}C? Give your answer in moles
to at least three significant figures. Hint: There will be air left
in the tank when the it reaches the lowest pressure the tank can
deliver. The amount of air left might be useful in solving this
problem.

Answer #1

PV = nRT

Initial mole:-

Pi*V = ni*R*Ti

2.3x10^{7} * 16
*10^{-3} = n_{i} * 8.314 *(273.15 +
25)

n_{i} =
2.3x10^{7} * 16 *10^{-3} / 8.314 * 298.15

= 148.457 mole initially

final mole :-

n_{f} =
P_{f} *V / R*T_{f}

= 2.5x10^{6}
* 16 *10^{-3} / 8.314 * 279.15

= 17.235 mole

mole provided = n_{i} -
n_{f} = 148.457 - 17.235

**= 131.222 mole**

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The tank has a volume of 11.5 L. If the tank will continue to
provide air until it reaches a pressure of 1.2x106 Pa, how many
moles of gas will it provide to a diver diving in water at 10 oC?
Give your answer in moles to at least three significant figures.
Hint: There will...

2. An aluminum scuba tank, which has an internal volume of 11.1
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To what pressure does the air in the tank drop? (The thermal
coefficient of expansion for aluminum is 24.0x10-6 OC -1 .)
Answer: 2880 psi
Please show steps and pictures!

2. An aluminum scuba tank, which has an internal volume of 11.1
L, is filled with air to a pressure of 3000 psi when at room
temperature (i.e. 20.0 OC). A diver takes the tank into seawater,
where the water temperature is 46 degrees Fahrenheit (i.e. 8.00OC).
To what pressure does the air in the tank drop? (The thermal
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Answer: 2880 psi
Don't need #2, just #3 please.
3. For...

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do all five questions
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Ignoring the effects of air resistance, if a ball falls freely
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Group of answer choices
increases
remains the same
not enough information
decreases
Flag this Question
Question 2
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