Professional divas sometimes use heliox, consisting of 79% helium and 21% oxygen by mole. Suppose a perfectly rigid scuba tank with a volume of 11 L contains heliox at an absolute pressure of 2.1 × 10 7 Pa at a temperature of 31 ℃. (a) How many moles of helium and how many moles of oxygen are in the tank? (b) The diver goes down to a point where the sea temperature is 27 ℃ while using a negligible amount of the mixture. As the gas in the tank reaches this new temperature, how much heat is removed from it?
Professional divas sometimes use heliox, consisting of 79% helium and 21% oxygen by mole. Suppose a perfectly rigid scuba tank with a volume of 11 L contains heliox at an absolute pressure of 2.1 × 10 7 Pa at a temperature of 31 ℃. (a) How many moles of helium and how many moles of oxygen are in the tank? (b) The diver goes down to a point where the sea temperature is 27 ℃ while using a negligible amount of the mixture. As the gas in the tank reaches this new temperature, how much heat is removed from it?
Professional divas sometimes use heliox, consisting of 79% helium and 21% oxygen by mole. Suppose a perfectly rigid scuba tank with a volume of 11 L contains heliox at an absolute pressure of
2.1
×
10
7
Pa at a temperature of 31 ℃. (a) How many moles of helium and how many moles of oxygen are in the tank? (b) The diver goes down to a point where the sea temperature is 27 ℃ while using a negligible amount of the mixture. As the gas in the tank reaches this new temperature, how much heat is removed from it?
Ideal gases are often studied at standard ambient temperature and pressure (SATP). The International Union of Pure and Applied Chemistry (IUPAC) defines SATP to be T = 25° C and P = 100 kPa.
33% Part (a) At SATP, which of the following is true about the number of molecules per unit volume N/V of ideal gases?
The number density of all ideal gasses at SATP is the same. ✔ Correct!
33% Part (b) Calculate N/V (in particles per cubic meter) for an ideal gas at SATP
N/V = 2.43 * 1025N/V = 2.43E+25 ✔ Correct!
33% Part (c) How many atoms of an ideal gas at SATP are there in one cubic centimeter? - i need help with this one
In the lungs, the respiratory membrane separates tiny sacs of air (absolute pressure=1.00x105 Pa) from the blood in the capillaries. These sacs are called alveoli, and it is from them that oxygen enters the blood. The average radius of the alveoli is 0.125 mm, and the air inside contains 14% oxygen, which is somewhat smaller amount than in fresh air. Assuming that the air behaves as an ideal gas at body temperature (310 K), find the number of oxygen molecules in one of the sacs.
A high-pressure gas cylinder contains 50.0 L of toxic gas at a pressure of 1.55 × 107 Pa and a temperature of 25.0°C. Its valve leaks after the cylinder is dropped. The cylinder is cooled to dry ice temperature (-78.5°C) to reduce the leak rate and pressure so that it can be safely repaired.
What is the final pressure, in pascals, in the tank, assuming a negligible amount of gas leaks while being cooled and that there is no phase change?
To what temperature, in kelvins, must the tank be cooled from its initial state to reduce the pressure to 1.00 atm (assuming the gas does not change phase and that there is no leakage during cooling)?
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