Carbon dioxide is a gas at 20 Celsius. It deposits into a solid at -80 Celsius.
At 20 degrees Celsius and 25 ATM pressure, carbon dioxide would be in a supercritical state, exhibiting properties of both a gas and a liquid.
In these conditions carbon dioxide is a gas.
It exists either as a gas as carbon dioxide or CO2, or it is dissolved in water as H2CO3 (note that if you add the formulas for water and carbon dioxide, you get carbonic acid: H2O + CO2 --> H2CO3). You cannot have pure carbonic acid that is not in the presence of water, and thus H2CO3 exists ONLY as a dissolved solution in water.
Henry's law constant for Carbon Dioxide at 20 degrees Celsius is: 1,6*10^3 ATM
To determine the volume of carbon dioxide needed, you would need to know the stoichiometry of the reaction between carbon dioxide and calcium carbonate. In this case, since 20 grams of calcium carbonate is given, you would convert that to moles using the molar mass of calcium carbonate. Then, using the balanced equation, you can determine the mole ratio between carbon dioxide and calcium carbonate. Finally, using the molar volume of carbon dioxide gas at the given conditions (usually 22.4 L/mol at standard temperature and pressure), you can calculate the volume of carbon dioxide needed.
Oxygen makes up roughly 20% of the atmosphere. Carbon Dioxide makes up 0.035% of the atmosphere.
20-29mEq/l
Oxygen gas (when we exhale, we breathe out carbon dioxide).
The air which we are breathing is containing about 20% ofcarbon dioxide which got into our bodies while breathing.
The Earth's atmosphere is approximately 79% Nitrogen, 20% Oxygen and 1% other gasses - including Argon, Neon and Carbon Dioxide.
There are thousands of substances which are gas at 20 deg C.
The exchange of carbon dioxide for oxygen in the body normally occurs about 12-20 times per minute at rest during breathing. This allows for the uptake of oxygen by the lungs and the release of carbon dioxide as a waste product.