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During the making of steel, iron(II) oxide is reduced to metallic iron by treatment with carbon monoxide gas.
FeO(s) + CO(g) Fe(s) + CO2(g)
Suppose 1.53 kg of FeO reacts. What volume of CO(g) is required, and what volume of CO2(g) is produced, each measured at STP?

If water is added to magnesium nitride, ammonia gas is produced when the mixture is heated.
Mg3N2(s) + 3 H2O(l) 3 MgO(s) + 2 NH3(g)
If 12.9 g of magnesium nitride is treated with water, what volume of ammonia gas would be collected at 21°C and 747 mm Hg?

Suppose that 1.37 g of neon gas and 2.50 g of argon gas are confined in a 9.92 L container at 27°C. What would be the pressure in the container?

The label on an aerosol spray can contains a warning that the can should not be heated to over 130°F because of the danger of explosion due to the pressure increase as it is heated. Calculate the potential volume of the gas contained in a 503 mL aerosol can when it is heated from 25°C to 54°C (approximately 130°F), assuming a constant pressure.

What pressure would be needed to compress 26.3 mL of hydrogen at 1.14 atm to 25% of its original volume?

A 1.15 L sample of gas at 759 mm Hg pressure is expanded until its volume is 2.29 L. What will be the pressure in the expanded gas sample (at constant temperature)?

Carbon dioxide gas, in the dry state, may be produced by heating calcium carbonate.
CaCO3(s) CaO(s) + CO2(g)
What volume of CO2, collected dry at 55°C and a pressure of 759 torr, is produced by complete thermal decomposition of 11.7 g of CaCO3?

If 12.8 g of liquid helium at 1.7 K is completely vaporized, what volume does the helium occupy at STP?

How many grams of carbon dioxide are contained in 1.170 L of the gas, at 25°C and 101.325 kPa?
g
What is the density of the gas at these conditions?
g/L
What would the density of oxygen be at these conditions?
g/L

I have an Amana Air/Conditioner & Heater unit in my wall.

Should I set the lever to "fresh air" or to "exhaust"? I would imagine "exhaust" means recirculated air — but perhaps it means the heat that is generated and exits the machine because it is a 2 in 1 unit.

Also, the unit doesn’t always work for the fan setting or the heat setting, but it does work for the A/C setting. Are there hazards in not getting this repaired (ie fire, carbon monoxide, etc.)?

The unit works, and I want to maxamize coolness without any danger.
NOTE: I don’t know what "closed" means. Is this the same as "exhaust"?

in all seriousness now… i was wondering if the day before a dive (from like 5-8) if i go to a friends house and smoke some hookah/shisha with them, would it be bad for a dive the next morning… i am aware alcohol and diving dont mix, but would hookah, which is the same stuff as cigarettes be bad and cause black outs? cause it is just tobacco and mollases with flavoring (i use apple)

thoughts? or maybe you can answer this, smoking a cigarette before a dive, good or bad? and i dont mean like ‘will you use your air faster’ i mean will there be anything left over?

the dangers im worried about are the carbon monoxide molecules sticking to your blood cells limiting your amount of air down below; however, would 12 hours be enough to clear it?

Ive been reviewing many answers on yahoo answers about this topic and they all seem to go back and forth. So im asking a more specific question in search of VERY specific answers..

Our electricity has been out for about 48 hours now and my duplex is getting pretty cold. Ive got no heat, no electricity, only gas, which allows me to still have hot showers as the hot water heater works only on gas alone with a non-electrical thermostat.

Being the house is so cold, Ive tried to light the gas oven and that didn’t work. I also tried to light the gas stove top and that DID work. I used an electric fire starter to light the stove top because the electric pilot light starter doesn’t work due to the power outage. Over the last two days that the power has been out, ive been able to cook lunch and dinner on the stove top as long as i light it myself. Ive found nothing wrong with doing that and the stove stays lit just fine. The flame also looks normal like it should the whole time im cooking at any gas setting I want.

Well, I started to think, whats the difference in leaving the stove top on with the flame going or having a gas fireplace running ? Flame is flame and heat is heat so whats the difference ? is what i was thinking.. So I left the stove top flame on and I went to the hardware store. As long as its burning, whats the deal ?

Well I came home last night from the hardware store and my roommate was home.. and earlier this morning, he rips my ass for leaving the stove top on and leaving the house.. He claims that I could have blown the house up, or killed him and his girlfriend and he was really upset. He claimed that I could have killed them both by carbon monoxide poisoning. I apologized and told him im sorry. I also said I wont ever do it again for his sake to avoid further conflict but, Ive spent the whole day thinking about it and I cant see the severity of the issue any differently.

We have a gas water heater in the basement of this duplex with a flame the size of large dinner plate underneath it that stays lit and running on high for hours after we take long hot showers. And that’s not dangerous or been a threat to him or us at all. Same thing, its just under a tank full of water rather than on top of a stove.

Growing up with my mom, we use to turn the stove on and the stove door cracked open all day long for heat. And that was a gas stove with a flame on the inside bottom of it too ! She also had a gas fireplace installed later and we have left that thing running all night before for heat and it hasn’t been a threat or danger to use.. A lot of people all over the world use gas fireplaces. Ive heard a bunch of people talk about cracking the windows or doors to prevent carbon monoxide poisoning ? Well why in the world would you crack a door or window when its 10 below outside and your purpose is to get heat anyways ? sounds stupid to me.

He even argued, well what if something would have fell on the stove or flame ? then the whole house would have burnt down.. And well, yeah that’s true, but, there’s nothing around the stove that could have ever "fell" on top of it anyway to even become ignited.

So Im not asking for opinions from Worried Willeys, Negative Nancies, or Safety Suzies. I simply want to know the facts.. Also… if carbon monoxide is produced from from the combustion of natural gas such as with a stove top, which i could understand. I would like to get an idea of how much.. Like.. if You leave two stove tops on and burning at medium strength for say an hour… Is that really going to do any harm ? or pose any threat ? People all around the world cook for longer and harder intervals than that on holidays and often a few times a week ! And gas fireplaces stay burning way longer than that as well. So is my roomate blowing this out of proportion ?

Southern Ohio. Winter temps seldom go below +20 but in theory -10 is possible. And with Al Gore running lose, you never know….

If it was my house I know lots of ways to solve the problem.
But Dad been there for 35 years (Southern Ohio suburbs) and sees no reason to worry about if the power goes out for very long, because it never did before, for very long. "Normalcy Bias"

Situation: Nice neighborhood, brick house, unused fireplace with plywood blocking it and it hasn’t been inspected in years. Although central (natural gas) heater and gas water heater in basement are vented up through the chimney, so we may safely assume the chimney has nothing living in it and at least it is not blocked. But of course fireplaces suck for heating a 2 story house, most of the heat goes up the chimney. And a fireplace on ground floor will not prevent pipes from freezing, which is my main concern. I can keep Dad warm, but if the pipes freeze, I’d have to move him out.

Being resistant to "change", he is unwilling to allow installation of VENTED propane alternate system (which wouldn’t actually cost that much, he could afford it). Can’t use portable propane heaters due to carbon monoxide danger. Systems must be vented and that means professional installation through external brick wall, and of course moving furniture around to create bare (non-rug) floor space for such things. He doesn’t think such things are necessary, will trust to luck.

So I’ve been racking my brain thinking what could be done with existing infrastructure.

So far the only thing I can think of is, there is a natural gas water heater in basement and he already has lots of garden hoses. Lots. New unused on garage shelves plus those in service. I could probably water a lawn a block away if I salvaged all those from the yard barn . If the electricity goes off, it is highly probable that the tap water and natural gas service will remain on.

So I was thinking, in an emergency, I could run some hoses from the water heater in basement, around in there to keep the pipes warm (and since heat rises, it may help the first floor too, no insulation between…) and then run a hose up the basement steps and around the first floor to keep the place kind of habitable. Run the faucets a little (which he does every winter at night) so nothing freezes up.

But if I ran garden hoses to circulate warm water around the house, the end of the hose kind of has to go back into the T(emperature)/P(ressure) valve on the side of the water heater to maintain water pressure in a closed loop. Easy enough to do. And with the water heater running full blast, and all that hose, surely a closed loop would work, even with the TP valve compromised by being left open. Right?

Suggestions? He has enough firewood to last about 3 days (nights) assuming the fireplace still works and I could persuade him to encamp before it, move some furniture, create a mini environment in front of it, close off the rest of the house. But that wouldn’t prevent the pipes from freezing.
The guy is welded to the pristine upper middle class suburbia ("I want grass not vegetables") reality. Won’t go for a wood stove. Maybe I can persuade him to have fireplace inspected. But he never uses the living room, it is a shrine to the 70s, with a barricade to keep the dog out of it.
@ceece: he’s 85. Doesn’t need much as long as status quo remains. But if the sheit hits the fan, he’s going to need some help. Eventually, one of us ‘kids’ is going to have to take charge. And I am on the scene, the eldest son and trained in survivalist wackoism. Unfortunately, I need to not rock his boat too much, until it becomes necessary. Gotta leave the guy some dignity so long as he can handle it.