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An average adult breathes about 0.5 L of air per breath at rest. Normal air contains ~ 0.03 % of CO2 which gets enriched to 4 % of exhaled air. The difference, 3.97 % is what you exhaled. One mole of air at room temperature have a volume of ~22.4 L (use ideal gas equation p*V=n*R*T, p=pressure [bar], V=volume, n=amount in mole, R=ideal gas constant, T=temperature [Kelvin]). 1 mole CO2 is equivalent to 44 g.

So, 0.5 L*(1 mole /22.4 L)*(44 g / mole) = 0.982 g

One breath therefore contains ~ 1 g of exhaled CO2

Note: Some of the gases are not ideal (mostly CO2), the volume of one breath depends on the person (sex, age, fitness, size) and the activity. It can be up to 2 L at least. But it is just an approximation anyways.

Btw - 1 kWh of electricity cost about 600 g of CO2. An average light bulb of 60 W therefore gives rise to the production of 10 g CO2 / s during use (not counting its production or disposal).

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If one breath is 4% CO2 and 1 breath is 0.5 liter, Mass of CO2 = 0.04*0.5 L* (1/22.4) mol/liter* 44 g/mol * (273 K/310 K) = 0.035 g/breath, not 1 g/breath. Body temp is 37 oC = 310 K, but that's a minor point.

If 1kWh results in 600 g of CO2, 60 Watts leads to 60W*600 g/kWH *(1/3600) h/sec *(1/1000) kw/W= .01 grams/second of CO2 not 10 g/sec. Otherwise people may feel guilty about breathing.

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some serious problems with the decimal place in the original answer. atmospheric content co2 is roughly 350 PPM or .00035, less than the original answer by several orders of magnitude. maybe that's why all the histeria about global warming, smoking in the boys room during middle school math....

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18 & 1/2 tons per second. All in all there's about 2875640 Billion tons of co2 emitted everyday.

Doesn't the driver ( and any passengers ) in the car emit CO2 as well, so you are not comparing like with like.You must compare CO2 from Car, driver and passengers with CO2 emitted by cyclist to be more accurate.You will need to divide the CO2 for car driver and passenger by number of occupants of car to get CO2 per person per journey

It would depend on the person's size and how active they are. Find the CO2 rates for an hour during sleep and being awake, multiply them by whatever you need and you'll figure out an annual estimate. However, a rough estimate (curtesy of "The Earth Blog") assuming 12 breaths per minute (resting breath rate) is 500kg The number is easy to estimate: breaths per minute x CO2 per breath x minutes per year From Wiki - the breath rate is 12 to 25 per minute. Size of breath is 500 mL. Percent CO2 exhaled is 4% so CO2 per breath is approx 0.04g ( 2g/L x .04 x .5l). CO2 Per year= 12 x 0.04 x 525600 (minutes per year) = 252kg/yr CO2 (25 breaths) = 525 Kg/yr. So - pick a number between 252 Kg/yr and 525Kg/yr 1000 lbs/year is a good figure of merit.

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Too much !

A Hummer parked in a garage emits almost zero CO2 over the course of a year. The Hummer H2 gets around 10 to 12 mpg. Assuming the typical owner drives 15,000 miles per year, that is around 1300 gallons of gas. Each gallon of gas burned results in 14 pounds of CO2. Multiplying these last two figures we get 9.5 tons of CO2 emitted per year, per Hummer, on average.

To obtain the number of grams of CO2 emitted per gallon of gasoline combusted, the heat content of the fuel per gallon is multiplied by the kg CO2 per heat content of the fuel. The average heat content per gallon of gasoline is 0.125 mmbtu/gallon and the average emissions per heat content of gasoline is 71.35 kg CO2/mmbtu.

1 Mol of CO2 is 44g, so 1.01Mol*44(g/mol) = 44.44g However, the average human breath contains roughly 1g of CO2 per breath (assuming 0.5 L of air inhaled then exhaled) We can assume an average breathing rate of 12 breaths per minute. In 1 week (7 days/168 Hours/10,080 Minutes) we have approximately 120,960 breaths per week, at an average of 1 gram per breath we will have about 120.96 kg in a week or 3.145 metric tons per year, to put that in perspective, your average car produces less in the same time frame assuming you drive a modern small car about 1,000 miles per month. 2,200,000,000,000 tons of CO2 per year if you take just people into account (7 billion)

It depends upon the age of the forest, old forests do not absorb any extra CO2 from the atmosphere. Replanting a forest will only reabsorb the CO2 emitted by the trees that were chopped down. An acre of rain-forest, if it is virgin forest (that is planted on land that has not being forested for over 100 years) absorbs about 135KG of CO2 per year. Twenty acres of rain forest absorbs 80 tons of CO2 in a year - the amount of Co2 emitted from burning 8000 gallons of gasoline. Therefore 1 acre of rain forest would absorb 4 tons of CO2 in a year. The Amazon rainforest absorbs 1.5 billion tons of carbon dioxide from the atmosphere every year.

The UK produces about two per cent of the world's CO2 emissions. Only two per cent of the UK's CO2 emissions derive from private motorised transport.

coca cola can contain anywhere between 4-7 grams of CO2 per ml.

The air around you is made up of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide with respect to volume. The composition of what you exhale has 4-5% CO2. Since we can't count the same CO2 twice we will ignore the inhaled amount, as it is still present in the exhaled figure. So our equation should look like this.CO2 exhaled = (Volume of breath) x (breaths taken per hour) x (hours per day) x (days per year) x (population of planet) x (percent of breath that is CO2)Alright, let assign some values to these:Volume of Breath = about 500ccbreaths per hour = 960hours per day = 24days per year = 365population of planet = 6,775,235,741percent of breath that is CO2 = 5co2 exhaled =1.42442556 × 10^18 or 142442556000000ccOR142442556000000 LitresOR142442556000 cubic metresBut really I suppose that means nothing unless put into perspective. If contained into Olympic sized swimming pools, it would take56 977 022 to hold it all. Might seem like alot, but really it's not if you consider the size of what it is to be compared to.

Each liter of gasoline produces 1.7 kg (3.7 lbs) of CO2. There are about 509 liters per kg of CO2, or 865 liters emitted by one liter of fuel. Gas occupies much greater volume than liquid. Burning gas, however, combines it with atmospheric oxygen, increasing the volume more yet.

Depending on the source of natural gas. Approximately 51kg of CO2 per GJ.

30 kg per kilometre for a 747

The average atmospheric concentration is 385 parts per million (volume).

30g CO2e + 2,4g CO2e landfill

The brain uses a CO2 - O2 feedback system. CO2 rises as O2 is depleted. The brain receives signals of rising CO2, and triggers the diaphragm.Incidentally, this system becomes reversed in emphysema and severe lung conditions. The brain becomes accustomed to rising CO2. IF too much O2 is administered externally, it will stop the brain from signalling the next breath. So while a person with healthy lungs can tolerate external O2 at 8 liters per minute, people with emphysema can only tolerate no more than 2 liters per minute---or the person will stop breathing.

Car pooling puts several people into one car instead, usually, of just one, so the amount of Carbon dioxide (CO2) emitted by the burning gasoline or diesel is much less per person. This eases global warming a little.

A power plant burning coal will emit almost 3 tonnes of carbon dioxide for every tonne of coal burned. Coal fired power plants are found all around the world. Data will be examined for US power plants. There are 492 coal-fired power plants in the U.S., with an average size of 667 megawatts (MW). The 2009 USEPA estimate of CO2 emissions is 1,329 lbs CO2 per megawatt-hour. This puts the total CO2 emission at about 1,900 million metric tonnes of CO2 a year.

About 8 ml of tidal volume per kg of body weight. An 5 kg baby (11 lbs) would breath about 40 ml of air per breath.

A bus can carry many more people than a car, so the amount of Carbon dioxide (CO2) emitted by the burning gasoline or diesel is much less per person. This eases global warming a little.

About 61,500 pounds per year.

The primary gas discharged by volcanoes is not CO2 by H2S, hydrogen sulfide. Currently Mt. St. Helens is Washington's top polluter, emitting about 100 tons of sulfur dioxide per day. Previously that distinction would have gone to one coal fired plant near Centralia, which emitted 200 tons of H2S per day until state regulators insisted on renovations which brought the emissions down below 30 tons per day. The eruption released somewhere in the neighborhood of 200,000 tons of CO2. In contrast, humans emit about 30,000,000,000 tons of CO2 per year, or 150,000 times as much. According to the USGS, that is well over 100 times as much as all earth's volcanoes combined.

Carbon dioxide has a molar mass of 44.0095 grams per mole. This means that one molecule of CO2 will have a mass of 7.308 E(-23) grams.