Oxygen

A 20 cm diameter cylinder that is 40 cm long contains 44 g of oxygen gas at 50°C.
What is the reading of a pressure gauge attached to the tank?

You would have to use the ideal gas law pv=nRT.
Start with known values:
R=8.31 J / mol*K (constant)
T= 50 C or 323K
r = 10 cm
h = 40 cm
m(O2) = 44g
M(O2) = 32 g/mol

Then find unknown values:
v=pi*r^2*h
=3.1415*10cm ^ 2*40cm
v = 13 000 cm3 or 13L

n(O2)= m(O2)/M(O2)
=44g / 32 g/mol
n(O2) = 1.4 mol

Then substitute and solve.
pv=nRT
p=(nRT)/v
=(1.4 mol * 8.31 J/mol K * 323K) / 13L
p= 290 kPa

After arriving in the South Col at Everest C4, Rob Hill and Teng Dorje found 5 oxygen cylinders from their cache had been “borrowed” by another unknown team.

Duration : 0:5:21

Read the rest of this entry »

As a welder, I know that there is available technology to take carbon dioxide out of the air and put it into gas cylinders. It would be the same as the stored fossil fuels carbon under ground but in cylinders, but then the problem of separating the oxygen from the carbon so we don’t suffocate ourselves. So is there a way to separate the carbon from oxygen in carbon dioxide?

"Is there a way to separate the carbon from oxygen in carbon dioxide?"

Coal is mostly carbon. When you burn it, the process consumes a lot of oxgyen, it liberates a lot of energy, and it turns the coal and the oxygen into mostly carbon dioxide. You are asking if it is possible to reverse the process.

Any chemical reaction can be reversed under the right conditions. I don’t know what those conditions would be exactly to reverse the burning of coal, but the process would consume a whole lot of carbon dioxide and a whole lot of energy, and it would give you back coal (well, pure carbon actually, maybe as coke or as graphite) and oxygen. How much energy would it take? Well it would take at LEAST as much energy as you got from burning the coal in the first place. Probably more. Probably a LOT more because (a) no process is 100% efficient, and (b) there’s this little problem called "entropy."

If your goal at the end of the day is to have a big pile of coal and some oxygen to breathe, then you are way ahead of the game if you just don’t burn the coal in the first place.

_____________________________
D’Oh! Almost forgot, Probably the most cost effective way to separate carbon dioxide into carbon and oxygen.

Plant trees.

When the trees mature, cut ‘em down, bury the logs in some slightly acidic swampy place, and then sit back and wait about 300 million years. If you do it right, they’ll turn to coal. If you don’t want to wait the whole 300 million years, you can bake the logs in an oxygen-free kiln until all of the cellulose has been converted to charcoal and steam.

If your goal is to remove CO2 from the atmosphere, then they key is to sequester the logs/charcoal. If you just leave the logs exposed to the weather, or if you bury them in the wrong sort of place, then they will be decomposed by fungi, and all of the carbon will eventually be released back into the atmosphere.

This video shows the Digital Wave Corporation’s UE23 in action scanning medical oxygen M6 cylinders. You will see the tech scanning at a rate of 70 cylinders per hour here. This blows the traditional inspection technique of using Hydrostatic testing out of the water. For more on this technology go to www.digitalwavecorp.com

Duration : 0:2:1

Read the rest of this entry »

This video shows us getting the gold medal in the hospital.

One thing Ive noticed is while the particular room we defended is a popular one, people often wait until the zombies break down the door to move into it. This practice can be dangerous and is completely unnecessary.

As you can see by using the oxygen cylinders provided and a few pipe bombs you can easily blow open the doors yourself with lots of supplies to spare.

If you would like to see the run from a different perspective, namely HybridProjectAlphas point of view you can find it here:

(You can hear me speak in his video where as you cant in mine)

Duration : 0:7:57

Read the rest of this entry »

Gases are sold in large cylinders for laboratory use. What pressure, in atmospheres, will be exerted by 2,500g of oxygen gas (O2) when stored at 22°C in a 40.0 L?

Thanks in advance to anyone that answers.

We can use the equation PV=nRT
which means that P=(nRT)/V

u can then subsitute what u know- P=(781.25mols * .0821 * 295K)/40L

P=473.037atm

my chem is somewhat rusty but i believe this is correct

Almost 100 years ago, medical researches started address the functions of the human body when rising up in high altitudes, and the effect of being at high atmosphere. Aero- and space medicine gives so much details of this issue, in which the dyspnea is explained in two main causes:

1- Less oxygen rates in high altitudes.

2- Decrease of air pressure.

The more we rise up from the surface of the earth, the more the air pressure decreases, thus leading to decrease of the rate of air passage through alveoli pulmonis to blood. Decrease of air pressure also leads to distention of gases in stomach and intestines that push the diaphragm upwards, thus pressing over and obstructing the extension of lungs.

Stages of the symptoms of oxygen shortage phenomena:

These are divided into four stages that relate to air pressure and the level of altitude and the rate of oxygen concentration in blood.

1- The stage of non alteration, i.e., from the level of sea to an altitude of 3 km. In this stage, the symptoms of oxygen shortage are not present and sight is not affected at day time.

2- The stage of physiological adjustment, i.e., from an altitude of 3 km to 5 km. Body systems function in this stage in such a way that will not let the symptoms of oxygen shortage appear, unless the period of exposing to such a shortage is elongated, or the person exerts physical effort in such conditions. In that case, rates of respiration, pulse, blood pressure and circulation increase in number and depth.

3- The stage of physiological disturbance, i.e., from an altitude of 5 km to 8 km. In this stage, body systems, particularly the lungs, cannot afford to function properly or supply the quantity of oxygen needed by tissue sufficiently. Hence the symptoms of oxygen shortage appear. In this stage, a clear explanation is established for man’s feeling of exhaustion, headache, feeling like to sleep, dyspnea and chest tightness when rising up in high altitudes. As a result of air pressure decrease, all air comes out of lungs and alveoli pulmonis, reducing the size of lungs and chest (i.e., the chest becomes really tight).
4- The stage of chest tightness, i.e., from an altitude of 8 km upwards. In this stage, man loses consciousness totally due to the failure of the nervous system, and condition becomes critical.

The Quran which was revealed fourteen centuries ago to Prophet Mohammed (PBUH) states: “Whomsoever Allah desires to guide, He expands his chest to Islam; whomsoever He desires to lead astray, He makes his chest narrow, tight, as if he were climbing up to the sky.” (6:125)

{فّمّن يٍرٌدٌ اللَّهٍ أّن يّهًدٌيّهٍ يّشًرّحً صّدًرّهٍ لٌلإسًلامٌ ومّن يٍرٌدً أّن يٍضٌلَّهٍ يّجًعّلً صّدًرّهٍ ضّيٌَقْا حّرّجْا كّأّّنَّمّا يّصَّعَّدٍ فٌي السَّمّاءٌ} (الأنعام:125)

Thus, this verse displays a miraculous similitude when presenting a scientific fact in a very eloquent and accurate style. Points of the miracles of this verse are:

1- When people first heard of the verse of man’s climbing to sky (space) , they considered it as a sort of imagination, and that Quran regards the ascension to space in a metaphorical manner. Actually the verse is a prophecy that came true centuries after it was first revealed.

2- The similitude is very accurate, as climbing to high distances in the air causes chest tightness and the feeling of suffocation. The more the ascension increases, the more tightness reaches so critical and difficult stage that respiration is not possible any more. That’s why oxygen cylinders are taken when ascending up the sky, as in space ships !

Source: www.islamicmedicine.org

Duration : 0:1:20

Read the rest of this entry »

150atm. The valve on the cylinder is left open in a small, sealed cold room. If the temperature in the room is 5C and the volume of the room is 1.75*10mL to the eighth power, what is the pressure in the room when all of the oxygen gas leaked out of the cylinder?

Can anyone help me with his one? I think that you use the Boyle’s Law.
Please show your work!

I would use the ideal gas law…more specifically…the combined ideal gas law…

P1*V1/T1 = P2*V2/T2

A member of the Luxfer Group of companies, Luxfer Gas Cylinders serves customers in major gas markets, including medical, life support, beverage, fire, scuba and specialty gases. No company offers a broader range of aluminum and composite gas cylinder products. Luxfer has grown to be a world leader in product quality and in product safety, with innovative programs for the markets it serves. With nearly 40 million cylinders already in service in more than 50 countries, Luxfer Gas Cylinders is truly setting the standard worldwide.

Duration : 0:10:0

Read the rest of this entry »

Provided that you don’t slam it to the ground, or do anything to damage its neck?

Nothing in particular.

If it’s full, and you do any of those things, then it could become a torpedo. Since it would have then released a large amount of oxygen into the immediate environment, any spark could be accelerated into an intense fire or explosion.